Associated Stirling numbers: second order reciprocal Stirling numbers (Fekete) [[n \over 3]]. The number of 3-orbit permutations of an n-set with at least 2 elements in each orbit.
15, 210, 2380, 26432, 303660, 3678840, 47324376, 647536032, 9418945536
1 seqfan posts
Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java