**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*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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