Triangle of multinomial coefficients, read by rows (version 1).
1, 1, 1, 1, 3, 1, 1, 4, 3, 6, 1, 1, 5, 10, 10, 15, 10, 1, 1, 6, 15, 10, 15, 60, 15, 20, 45, 15
2 seqfan posts
Wed Jul 25 16:48:09 CEST 2012 [seqfan] Re: collapsing permutations to mere Set Partitions(longish)