4751490domain: NAppears in sequencesNumber of compositions (ordered partitions) of n into powers of 3.at n=40A078932Satisfies A(x) = 1 + x*A(x)*f(x)^2, where f(x) = Sum_{k>=0} x^((3^n-1)/2) and f(x)^2 = 2 - f(x^2) + 2*Sum_{n>0} x^A023745(n).at n=20A087218