165873

Appears in sequences

• E.g.f.: exp(x+x^2+x^3+x^4).at n=8A193930
• Triangle read by rows: T(n,k) is the number of nilpotent subpermutations on an n-set, each of nilpotency index less than or equal to k.at n=40A261764
• Square array A(n,k), n >= 0, k >= 1, read by antidiagonals downwards, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} x^j).at n=74A293669