**Triangle read by rows: T(n,k) (n >= 0, 0<=k<=n) gives number of {0,1} n X n matrices with all row and column sums equal to k.**

*1, 1, 1, 1, 2, 1, 1, 6, 6, 1, 1, 24, 90, 24, 1, 1, 120, 2040, 2040, 120, 1, 1, 720, 67950*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

Links to OEIS content are included according to The OEIS End-User License Agreement .