661878domain: NAppears in sequencesNumber of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.at n=9A151311Triangular array read by rows, T(n,k) = number of partial functions on {1,2,...,n} with exactly k cycles.at n=30A216520