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

A333740

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =7a(4) =194a(5) =601055a(6) =294494683312

External references