33251domain: NAppears in sequencesa(n) = A006690(n)/n^3.at n=3A082168Numbers n such that phi(n) = 3*phi(n-1).at n=36A266268Number of types of lambda-terms of term size n.at n=8A268225Magic sums of 3 X 3 semimagic squares composed of odd squares.at n=13A269297