The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A056521 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A056521

Number of primitive (period n) periodic palindromic structures using exactly four different symbols.
(history; published version)

#14 by Susanna Cuyler at Tue Oct 01 19:49:59 EDT 2019

STATUS

proposed

approved

#13 by Andrew Howroyd at Tue Oct 01 17:47:04 EDT 2019

STATUS

editing

proposed

#12 by Andrew Howroyd at Tue Oct 01 17:34:24 EDT 2019

DATA

0, 0, 0, 0, 0, 1, 1, 7, 10, 43, 65, 219, 350, 1058, 1701, 4796, 7770, 21094, 34105, 90205, 145749, 379326, 611501, 1573205, 2532530, 6465123, 10391735, 26378849, 42355950, 107089814, 171798901, 433088656, 694337225, 1746623215, 2798806984, 7029320466, 11259666950

LINKS

Andrew Howroyd, <a href="/A056521/b056521.txt">Table of n, a(n) for n = 1..200</a>

FORMULA

a(n) = A056515(n) - A056514(n).

This is the Moebius transform of A056510. - T. D. Noe, Oct 25 2006

CROSSREFS

Cf. A056483, A056510, A056514, A056515.

EXTENSIONS

Terms a(31) and beyond from Andrew Howroyd, Oct 01 2019

STATUS

approved

editing

#11 by N. J. A. Sloane at Tue Aug 22 20:53:14 EDT 2017

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

Marks R. Nester

Discussion

Tue Aug 22

20:53

OEIS Server: https://oeis.org/edit/global/2696

#10 by N. J. A. Sloane at Fri May 19 10:39:40 EDT 2017

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

Discussion

Fri May 19

10:39

OEIS Server: https://oeis.org/edit/global/2652

#9 by N. J. A. Sloane at Sun Apr 09 22:32:31 EDT 2017

STATUS

proposed

approved

#8 by Andrew Howroyd at Sun Apr 09 22:10:32 EDT 2017

STATUS

editing

proposed

#7 by Andrew Howroyd at Sat Apr 08 15:09:05 EDT 2017

DATA

0, 0, 0, 0, 0, 1, 1, 7, 10, 43, 65, 219, 350, 1058, 1701, 4796, 7770, 21094, 34105, 90205, 145749, 379326, 611501, 1573205, 2532530, 6465123, 10391735, 26378849, 42355950, 107089814

CROSSREFS

Column 4 of A285037.

EXTENSIONS

a(17)-a(30) from Andrew Howroyd, Apr 08 2017

STATUS

approved

editing

#6 by Russ Cox at Fri Mar 30 17:22:20 EDT 2012

FORMULA

This is the Moebius transform of A056510. - _T. D. Noe (noe(AT)sspectra.com), _, Oct 25 2006

EXTENSIONS

Corrected by _T. D. Noe (noe(AT)sspectra.com), _, Oct 25 2006

Discussion

Fri Mar 30

17:22

OEIS Server: https://oeis.org/edit/global/120

#5 by N. J. A. Sloane at Wed Dec 06 03:00:00 EST 2006

DATA

0, 0, 0, 0, 0, 1, 1, 7, 10, 43, 65, 219, 350, 1058, 1701, 479, 64796

FORMULA

This is the Moebius transform of A056510. - T. D. Noe (noe(AT)sspectra.com), Oct 25 2006

KEYWORD

nonn,new

nonn

EXTENSIONS

Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006