Define p(alpha) to be the number of H-conjugacy classes where H is a Young subgroup of type alpha of the symmetric group S_n. Then a(n) = sum p(alpha) where |alpha| = n and alpha has at most n parts.
1, 6, 39, 356, 4055, 57786, 983535, 19520264, 441967518, 11235798510
5 seqfan posts
Sun Mar 11 18:30:31 CET 2012 [seqfan] Re: additions for completeness' sake
Sun Mar 11 14:42:56 CET 2012 [seqfan] Re: additions for completeness' sake
Sun Mar 11 14:12:52 CET 2012 [seqfan] additions for completeness' sake
Sun Nov 15 11:16:21 CET 2009 [seqfan] Re: Formula for A124577 ?
Sun Nov 15 00:54:48 CET 2009 [seqfan] Formula for A124577 ?
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