64028672

Appears in sequences

• a(n) = 2^n*(n^3 - 3*n^2 + 2*n + 48)/48.at n=19A081913
• a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} gcd(x_1, x_2, x_3, x_4, n)^5.at n=31A372937