40320

Appears in sequences

• Order of the group SL(2,Z_n).at n=34A000056
• Number of invertible Boolean functions of n variables: a(n) = (2^n)!.at n=3A000722
• Sorted list of orders of Weyl groups of types A_n, B_n, D_n, E_n, F_4, G_2.at n=17A001217
• a(n) = n! if n is even, otherwise 0 (from Taylor series for cos x).at n=8A005359
• a(n) = (a(n-1) + a(n-2))!.at n=4A005607
• a(n) = (n-1)*(n+1)!/6.at n=6A005990
• (2*n)!-Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n).at n=3A006548
• Triangle read by rows of Stirling numbers of first kind, s(n,k), n >= 1, 1 <= k <= n.at n=36A008275
• Triangle of Stirling numbers of first kind, s(n, n-k+1), n >= 1, 1 <= k <= n. Also triangle T(n,k) giving coefficients in expansion of n!*binomial(x,n)/x in powers of x.at n=44A008276
• Triangle T(n,k) = n!/(n-k)! (0 <= k <= n) read by rows, giving number of permutations of n things k at a time.at n=44A008279
• Triangle T(n,k) = n!/(n-k)! (0 <= k <= n) read by rows, giving number of permutations of n things k at a time.at n=43A008279
• Erroneous version of A342587.at n=35A008285
• Triangle of coefficients in expansion of D^n (tan x) in powers of tan x.at n=28A008293
• Triangle of coefficients in expansion of D^n (sec x) / sec x in powers of tan x.at n=24A008294
• Triangle of Lehmer-Comtet numbers of the first kind.at n=45A008296
• Triangle of Lah numbers.at n=28A008297
• Triangle read by rows: T(n,k) (n >= 0, 0 <= k <= n) gives number of {0,1} n X n matrices with all row and column sums equal to k.at n=37A008300
• Triangle read by rows: T(n,k) (n >= 0, 0 <= k <= n) gives number of {0,1} n X n matrices with all row and column sums equal to k.at n=43A008300
• Triangle read by rows: T(n,k) = number of permutations of [n] allowing i->i+j (mod n), j=0..k-1.at n=35A008305
• Triangle T(n,k) read by rows: associated Stirling numbers of first kind (n >= 2, 1 <= k <= floor(n/2)).at n=16A008306