Let g be a permutation of [1..n] having say j_i cycles of length i, with Sum_i i*j_i = n; sequence gives Sum_g Sum_{i even} (j_i)^2.

A151883

Let g be a permutation of [1..n] having say j_i cycles of length i, with Sum_i i*j_i = n; sequence gives Sum_g Sum_{i even} (j_i)^2.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =24a(4) =120a(5) =840a(6) =5880a(7) =54600a(8) =491400a(9) =5276880a(10) =58045680a(11) =749770560a(12) =9747017280a(13) =142685262720

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