54480domain: NAppears in sequencesa(n) = ceiling(binomial(n,9)/n).at n=23A053733E.g.f. A(x) satisfies A(x) = 1 + log(1 + x^2*A(x)^2)/x.at n=6A218653Triangle read by rows. T(n, k) = n! * BellPolynomial(n, k).at n=17A350259Triangle read by rows: T(n, k) = n! * 3^k * hypergeom([-k], [-n], 2/3).at n=30A375600