47174400

Appears in sequences

• Expansion of e.g.f.: (1+2*x-2*x^2)/(1-x)^2.at n=10A052572
• E.g.f. x^2*(1-x)/(1-x-x^2).at n=10A052602
• E.g.f. (1+x-x^2)^2/(1-x)^2.at n=10A052643
• Triangle T(n,k) (1 <= k <= n) where the first column (T(n,1)) is the sequence of secant numbers A000364.at n=26A064670
• a(1) = 1. For n>1, the smallest number greater than n! with the prime signature of n!.at n=10A088300
• Number of ordered pairs of permutation functions f,g on a size n set where f(g(g(x))) = g(f(f(x))).at n=10A239836
• Numbers other than prime powers divisible by the sum, the sum of squares and the sum of cubes of their prime divisors.at n=5A268418
• a(n) = (n - 1)! * sigma_2(n), where sigma_2(n) = sum of squares of divisors of n (A001157).at n=9A318250
• Expansion of e.g.f. x^2/(1-x-x^2)^2.at n=9A364422
• Integers k such that A000010(k) <= A008480(k).at n=20A364750
• Expansion of e.g.f. (1/x) * Series_Reversion( x - (exp(x^2) - 1)^2 ).at n=10A392794