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A140963 Half the number of n X n symmetric binary matrices with each 1 adjacent to an even number of other 1's. 1
1, 3, 14, 99, 1082, 17997, 460186, 17967189, 1075650798, 98475760770, 13808877966564, 2962829880373443, 973285891955586078, 489313659027753121941, 376571597820325396861232 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Jul 27 2008, Table of n, a(n) for n = 1..21

CROSSREFS

Sequence in context: A336947 A038051 A132008 * A284759 A284760 A076015

Adjacent sequences:  A140960 A140961 A140962 * A140964 A140965 A140966

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 27 2008

STATUS

approved

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Last modified April 13 15:23 EDT 2021. Contains 342936 sequences. (Running on oeis4.)