The On-Line Encyclopedia of Integer Sequences (OEIS)

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A139046

Half the number of symmetric n X n binary matrices with the center of gravity of the 1s at the center.
(history; published version)

#8 by Jon E. Schoenfield at Mon Mar 09 04:29:13 EDT 2015

STATUS

editing

approved

#7 by Jon E. Schoenfield at Mon Mar 09 04:29:11 EDT 2015

LINKS

_R. H. Hardin_, , Jun 01 2008, <a href="/A139046/b139046.txt">Table of n, a(n) for n = 1..19</a>

STATUS

approved

editing

#6 by Russ Cox at Sat Mar 31 12:35:07 EDT 2012

LINKS

_R. H. Hardin (rhhardin(AT)att.net), _, Jun 01 2008, <a href="/A139046/b139046.txt">Table of n, a(n) for n = 1..19</a>

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net), _, Jun 01 2008

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#5 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

R. H. Hardin (rhhardin(AT)att.net), Jun 01 2008, <a href="/A139046/b139046.txt">Table of n, a(n) for n = 1..19</a>

KEYWORD

nonn,new

nonn

#4 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

LINKS

Ron R. H. Hardin (rhhardin(AT)att.net), Jun 01 2008, <a href="b139046.txt">Table of n, a(n) for n = 1..19</a>

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net), Jun 01 2008

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

LINKS

Ron Hardin (rhhardin(AT)att.net), Jun 01 2008, <a href="http://www.research.att.com/~njas/sequences/b139046.txt">Table of n, a(n) for n = 1..19</a>

KEYWORD

nonn,new

nonn

#2 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

LINKS

Ron Hardin (rhhrhhardin(AT)cadenceatt.comnet), Jun 01 2008, <a href="http://www.research.att.com/~njas/sequences/b139046.txt">Table of n, a(n) for n = 1..19</a>

KEYWORD

nonn,new

nonn

AUTHOR

Ron Hardin (rhhrhhardin(AT)cadenceatt.comnet), Jun 01 2008

#1 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

NAME

Half the number of symmetric n X n binary matrices with the center of gravity of the 1s at the center.

DATA

1, 2, 12, 52, 1992, 43472, 8084672, 785972800, 632010796352, 260819509251776, 879345967412550400, 1508148706710022883840, 20993821611583601278837888, 147923394778079541856196475392, 8426633557858801012990635249817088

OFFSET

1,2

LINKS

Ron Hardin (rhh(AT)cadence.com), Jun 01 2008, <a href="http://www.research.att.com/~njas/sequences/b139046.txt">Table of n, a(n) for n = 1..19</a>

CROSSREFS

Cf. A133413.

KEYWORD

nonn,new

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Jun 01 2008

STATUS

approved