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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. 1
1, 2, 12, 52, 1992, 43472, 8084672, 785972800, 632010796352, 260819509251776, 879345967412550400, 1508148706710022883840, 20993821611583601278837888, 147923394778079541856196475392, 8426633557858801012990635249817088 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Jun 01 2008, Table of n, a(n) for n = 1..19

CROSSREFS

Cf. A133413.

Sequence in context: A080675 A218782 A007225 * A036359 A055703 A242513

Adjacent sequences:  A139043 A139044 A139045 * A139047 A139048 A139049

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 01 2008

STATUS

approved

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Last modified January 19 17:45 EST 2019. Contains 319309 sequences. (Running on oeis4.)