187810

Appears in sequences

• Triangular array read by rows. T(n,k) is the number of partial functions on {1,2,...,n} that are endofunctions with no cycles of length > 1 that have exactly k components.at n=29A203092
• E.g.f.: -exp(x)*LambertW(-x).at n=7A277473
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. -exp(k*x)*LambertW(-x).at n=43A294411