127116domain: NAppears in sequencesa(n) = round(n*phi^18), where phi is the golden ratio, A001622.at n=22A004953a(n) = ceiling(n*phi^18), where phi is the golden ratio, A001622.at n=22A004973Number of positive integers <= 2^n of form x^2 + 9 y^2.at n=20A054153