3326473

Appears in sequences

• E.g.f. A(x) = exp(x+x^2+x^3+x^4+x^5+x^6).at n=9A193932
• 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=51A261764