Revision History for A024249
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing all changes.
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#8 by Harvey P. Dale at Mon Jan 30 12:01:04 EST 2023
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#7 by Harvey P. Dale at Mon Jan 30 12:01:01 EST 2023
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| MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[ [Tan[ [x ] ]*]]*Tan[ [x]/2, {x, 0, nn}], x ]/] Range[ 0, nn]!, {1, -1, 2 (* Even}]] (* _Harvey P. Dale_, Jan 30 Part2023 *)
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| EXTENSIONS
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Previous Mathematica program replaced by Harvey P. Dale, Jan 30 2023
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| STATUS
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approved
editing
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#6 by Russ Cox at Sat Mar 31 12:34:58 EDT 2012
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| AUTHOR
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_R. H. Hardin (rhhardin(AT)att.net)_
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Discussion
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| Sat Mar 31
| 12:34
| OEIS Server: https://oeis.org/edit/global/875
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#5 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009
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| KEYWORD
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nonn,new
nonn
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| AUTHOR
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R. H. Hardin (rhhrhhardin(AT)cadenceatt.comnet)
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#4 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004
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| NAME
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Expansion of tanh(tan(x)).))*tan(x)/2.
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| KEYWORD
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nonn,new
nonn
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#3 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003
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| KEYWORD
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nonn,new
nonn
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| AUTHOR
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R. H. Hardin (rhh@research.att(AT)cadence.com)
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#2 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999
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| NAME
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Expansion of tanh(tan(x)).tan(x).)/2.
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| DATA
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0, 1, 4, 24, 192, 9472, 1182208, 135668736, 14993473536, 1702145425408, 212302947942400, 32402586267549696, 6715751146400514048, 1845064263947813650432, 597912413872386432040960
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| OFFSET
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0,23
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| MATHEMATICA
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Tanh[ Tan[ x ] ]*Tan[ x ]/2 (* Even Part *)
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| CROSSREFS
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A009812.
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| KEYWORD
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,new
nonn
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| EXTENSIONS
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Extended and signs tested 03/97.
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#1 by N. J. A. Sloane at Sun Jun 14 03:00:00 EDT 1998
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| NAME
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Expansion of tanh(tan(x)).tan(x).
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| DATA
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1, 4, 24, 192, 9472, 1182208, 135668736, 14993473536, 1702145425408, 212302947942400, 32402586267549696, 6715751146400514048, 1845064263947813650432
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| OFFSET
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0,2
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| REFERENCES
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| AUTHOR
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rhh@research.att.com
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| STATUS
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approved
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