Schroeder's fourth problem; also number of phylogenetic trees with n nodes; also number of total partitions of n.
0, 1, 1, 4, 26, 236, 2752, 39208, 660032, 12818912, 282137824, 6939897856
1 seqfan posts
Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java