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%I #7 Mar 09 2015 04:31:02
%S 1,3,14,99,1082,17997,460186,17967189,1075650798,98475760770,
%T 13808877966564,2962829880373443,973285891955586078,
%U 489313659027753121941,376571597820325396861232
%N Half the number of n X n symmetric binary matrices with each 1 adjacent to an even number of other 1's.
%H R. H. Hardin, Jul 27 2008, <a href="/A140963/b140963.txt">Table of n, a(n) for n = 1..21</a>
%K nonn
%O 1,2
%A _R. H. Hardin_, Jul 27 2008
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