49168domain: NAppears in sequencesa(0) = 19; for n>0, successively subtract 5, subtract 3 and double.at n=42A106706G.f. = b(2)*b(4)*b(6)/(x^9+x^8+x^7-2*x^3-x^2-x+1), where b(k) = (1-x^k)/(1-x).at n=14A266376