42336000

Appears in sequences

• Triangle read by rows, T(n,k) = (k+1)*(n+1)!*(n+k)!/((k+1)!^2*(n-k)!) with n >= 0 and 0 <= k <= n.at n=31A253284
• Triangle read by rows, coefficients of polynomials in Pi^2, given by trigonometric double integrals over the unit square.at n=17A336239
• Coreful 4-abundant numbers: numbers k such that csigma(k) > 4*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=11A340110
• Sum of the divisors of A000129(n) (Pell numbers).at n=19A363829
• E.g.f. A(x) satisfies A(x) = exp( x^3*A(x)^3 * (1+x*A(x))^3 ).at n=9A387995