496376domain: NAppears in sequencesa(0) = a(1) = 1; for n > 1, a(n) = n*a(n-1) + (-1)^n.at n=9A001120a(n) = n*a(n-1) + (-1)^n for n>0, a(0)=2.at n=9A236438A(n,k) = !n + [n > 0] * (k * n!), where !n = A000166(n) is subfactorial of n and [] is an Iverson bracket; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=64A334715