2301618domain: NAppears in sequencesG.f. A(x) satisfies A(x) = 1 + x + x*A(x)^3.at n=9A366266Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,0) = 0^n and T(n,k) = k * Sum_{r=0..n} binomial(n,r) * binomial(3*r+k,n)/(3*r+k) for k > 0.at n=64A378318