1767240domain: NAppears in sequencesTotal number of cycles in all partial permutations of {1,2,...,n}.at n=8A216313Triangle read by rows, T(n, k) = n! * [y^k] [x^n] exp(1/(1 - x)^(1 + y) - 1), for 0 <= k <= n.at n=37A355267