26888677domain: NAppears in sequencesSquare array A(n,k), n>=0, k>=0, read by antidiagonals, where A(0,k) = 1 and A(n,k) = Sum_{j=0..n-1} k^j * binomial(n-1,j) * A(j,k) for n > 0.at n=51A306245G.f. A(x) satisfies A(x) = 1 + x * A(3 * x / (1 - x)) / (1 - x).at n=6A355081