19899390692domain: NAppears in sequencesG.f. A(x) = Sum_{n>=0} a(n)*x^n where a(n) = Sum_{k=0..n-1} 2^(n-k-1) * ( ([x^k] A(x)^n) (mod 2^n) ) for n > 0, with a(0) = 1.at n=20A376232