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%I #6 Jul 28 2022 03:28:49
%S 1,2,3,12,105,2369,173945,39994381,29262267753,69801229348136
%N Number of n X n binary arrays with rows and columns, considered as graycode numbers, in nondecreasing order, and an even number of 1's in each row or column.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jun 25 2009
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