Number of ways of transforming a set of n indistinguishable objects into n singletons via a sequence of n-1 refinements.
1, 1, 1, 2, 4, 11, 33, 116, 435, 1832, 8167, 39700, 201785, 1099449, 6237505
2 seqfan posts
Mon Jun 11 02:04:25 CEST 2012 [seqfan] Re: Request for help with mystery sequence N0320 = A213385