4004000

Appears in sequences

• a(n) = binomial(n+3,3)*binomial(n+7,3).at n=19A104474
• E.g.f. satisfies: A(x) = (1 + x*A(x))^A(x).at n=7A162655
• a(n) = n^3 * 2^n * binomial(3*n, n) / 3.at n=5A378781