121732domain: NAppears in sequencesG.f. satisfies A(x) = 1 + x*A(x)^3 + x^2*A(x)^3.at n=8A364475Square 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(3r+k,r) * binomial(r,n-r)/(3*r+k) for k > 0.at n=53A378323