a(n) = count of monomials, of degree k=n, in the elementary symmetric polynomials e(mu,k) summed over all partitions mu of n.
1, 5, 37, 405, 5251, 84893, 1556535, 33175957, 785671039, 2084113225
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Thu May 31 17:34:19 CEST 2012 [seqfan] Symmetric Polynomials A209668 A209671 Turn up