5253120domain: NAppears in sequencesNumber of odd divisors of n!.at n=41A336940Numbers k such that there exist three numbers x, y and z such that k = psi(x) = psi(y) = psi(z) = x + y + z.at n=17A387290a(n) = Sum_{k=0..floor(n/3)} (k+1) * 2^k * 3^(n-3*k) * binomial(k,2*(n-3*k)).at n=31A391960