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%I #4 Dec 18 2015 18:17:22
%S 1,1,4,8,40,226,2579,49498,1765630,113965238,13490574157,
%T 2926835209126,1169086294542192,862917161990013829,
%U 1181920894330563626871
%N Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and an odd number of ones in each row
%K nonn
%O 1,3
%A _R. H. Hardin_ Jun 25 2009
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