1814400

Appears in sequences

• Order of alternating group A_n, or number of even permutations of n letters.at n=10A001710
• a(n) = (2n)!/2.at n=4A002674
• Denominators of coefficients for central differences M_{4}^(2*n).at n=4A002676
• a(n) = A002034(n)!/n.at n=21A007672
• Triangle of numbers n!(n-1)!...(n-k+1)!/(1!2!...k!).at n=30A009963
• Triangle of numbers n!(n-1)!...(n-k+1)!/(1!2!...k!).at n=33A009963
• a(n) = n!*(n+4)! / 4!.at n=5A010793
• a(n) = n!*(n+1)!/2.at n=5A010796
• a(n) = n!*(n+1)!*(n+2)!*(n+3)!*(n+4)! / ( 2!*3!*4!*5! ).at n=2A010799
• Table of orders of primitive permutation groups by degree.at n=46A023675
• Triangular array a(n,k) = (1/k)*Sum_{i=0..k} (-1)^(k-i)*binomial(k,i)*i^n; n >= 1, 1 <= k <= n, read by rows.at n=53A028246
• Triangle giving number of labeled trees with n >= 3 nodes and diameter d >= 2.at n=35A034854
• Triangle read by rows, the Bell transform of (n+2)!/2 without column 0.at n=36A046089
• Generalized Stirling number triangle of first kind.at n=36A049458
• Triangle read by rows: T(n,k) = n!*k.at n=40A051683
• a(n) = n! *((-1)^n + 2*n + 3)/4.at n=9A052558
• Expansion of e.g.f. x/((1-x)(1-x^2)).at n=9A052591
• E.g.f. 1/(1-x^2-x^3).at n=9A052597
• E.g.f. (1-3x)/(1-3x-x^2).at n=7A052635
• Expansion of e.g.f. 5*x/(1-x).at n=9A052648