518918400

Appears in sequences

• a(n) = n! + (n-1)!.at n=11A001048
• Quadruple factorial numbers: a(n) = (2n)!/n!.at n=8A001813
• Quadruple factorial numbers n!!!!: a(n) = n*a(n-4).at n=30A007662
• a(n) = (4*n)!/(2*n)!.at n=4A009120
• Number of labeled cyclic groups with n elements.at n=12A034381
• Number of labeled Abelian groups of order n.at n=12A034382
• Number of labeled groups.at n=12A034383
• Number of permutations p of {1,2,3...,n} that are fixed points under the operation of first reversing p, then taking the inverse.at n=31A037224
• Number of permutations p of {1,2,3...,n} that are fixed points under the operation of first reversing p, then taking the inverse.at n=32A037224
• Triangle read by rows. A generalization of unsigned Lah numbers, called L[4,1].at n=36A048854
• a(n) = (n+8)!/8!.at n=8A049389
• Generalized Stirling number triangle of first kind.at n=36A051380
• Expansion of e.g.f. (1-x)/(1-x-x^3).at n=11A052557
• Decomposition of Stirling's S(n,2) based on associated numeric partitions.at n=37A058936
• Size of largest conjugacy class in S_n, the symmetric group on n symbols.at n=12A059171
• Hermite numbers.at n=16A067994
• a(n) = n! / floor(n/2)!.at n=16A081125
• a(n) = A081456(n)^(1/2).at n=18A081457
• Denominators of coefficients in (1+x)^(1+x) power series.at n=15A082526
• For n > 0, 0 <= k <= n^2, T(n,k) is the number of rotationally and reflectively distinct n X n arrays that contain the numbers 1 through k once each and n^2-k zeros.at n=26A087074