Number of n X 3 arrays with rows being permutations of 0..2 and no column j greater than column j-1 in all rows.
1, 19, 163, 1135, 7291, 45199, 275563, 1666495, 10038331, 60348079, 362442763
1 seqfan posts
Tue May 29 00:42:43 CEST 2012 [seqfan] Re: counting matrices by column rises