1036024domain: NAppears in sequencesThird convolution of A001405 (central binomial numbers).at n=15A054443G.f. satisfies A(x) = Sum_{n>=1} 2^(n-1) * A(x^(2*n))/A(x^n), with A(0) = 0 and A'(0) = 1.at n=20A378262