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%I A333740 #10 May 02 2022 09:49:14
%S A333740 1,1,2,7,194,601055,294494683312,14584161564179926207,
%T A333740 80055722734531008786502722278,
%U A333740 53505113579082591021525466231199449015539
%N A333740 Number of inequivalent 2n X 2n binary matrices with rows and columns summing to n, where equivalence means permutations of rows or columns.
%H A333740 <a href="/index/Mat#binmat">Index entries for sequences related to binary matrices</a>
%H A333740 <a href="/index/Mat#inequiv">Index to number of inequivalent matrices modulo permutation of rows and columns</a>
%F A333740 a(n) = A133687(2n,n).
%Y A333740 Cf. A133687.
%K A333740 nonn,more
%O A333740 0,3
%A A333740 _Alois P. Heinz_, Apr 03 2020

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