Array T(m,n) read by antidiagonals: T(m,n) (m >= 1, n >= 1) = number of ways to arrange the numbers 1,2,..,m*n in an m X n matrix so that each row and each column is increasing.
1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 1, 14, 42, 14, 1, 1, 42, 462, 462, 42, 1, 1, 132, 6006, 24024
1 seqfan posts
Sat Oct 2 23:41:41 CEST 2010 [seqfan] nXk permutations with a single error