A333740 Number of inequivalent 2n X 2n binary matrices with rows and columns summing to n, where equivalence means permutations of rows or columns.

1, 1, 2, 7, 194, 601055, 294494683312, 14584161564179926207, 80055722734531008786502722278, 53505113579082591021525466231199449015539

Offset: 0

Author

Alois P. Heinz, Apr 03 2020

Keywords

• nonn
• more

Links

• Index entries for sequences related to binary matrices
• Index to number of inequivalent matrices modulo permutation of rows and columns

Crossrefs

Cf. A133687.

Formula

a(n) = A133687(2n,n).