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%I #7 Mar 09 2015 04:31:18
%S 1,1,3,10,47,331,3767,62520,1518009,55743394,3088601538,255245736384,
%T 31478354074963,5821763616950936,1613533542340366588,
%U 669043996295174916639,415143729274794925159205
%N Number of n X n symmetric binary matrices with each 1 adjacent to an odd number of other 1's.
%H R. H. Hardin, Jul 27 2008, <a href="/A140964/b140964.txt">Table of n, a(n) for n = 1..21</a>
%K nonn
%O 1,3
%A _R. H. Hardin_, Jul 27 2008
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