1653120domain: NAppears in sequencesExpansion of e.g.f. (1-x)/(1 - x - x^2 - 2*x^3 + 2*x^4).at n=8A052681Triangle read by rows, k!*2^k*S_2(n, k) where S_m(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0.at n=41A225476