173817domain: NAppears in sequencesNumbers generated by recursive procedure a(n) = nozero(a(n-1) * 3), in which the function nozero(x) removes all zeros from x, starting with a(1) = 1.at n=23A243845G.f. A(x,y) satisfies: A(x,y) = x + A( x^2 + x*y*A(x,y)^2, y).at n=109A271868