Triangle read by columns: Distinct classifications of N elements containing exactly R binary partitions.
1, 0, 1, 0, 1, 1, 0, 2, 3, 3, 1, 1, 0, 3, 17, 36, 60, 56, 50, 27, 19, 6, 4, 1, 1, 0, 6, 74, 573
2 seqfan posts
Sat Jan 2 00:13:16 CET 2010 [seqfan] A005646 triangle (A171872) now linked to A039754