3305868domain: NAppears in sequencesG.f. A(x) satisfies A(x) = 1 + x * A(x)^3 * (1 + 2 * A(x)).at n=6A336539Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} 2^j * binomial(n,j) * binomial(k*n+j+1,n)/(k*n+j+1).at n=51A336574