7484400

Appears in sequences

• a(n) = (2n)!/2^n.at n=6A000680
• a(n) = (6n)!/(n!)^6.at n=2A008979
• Exponential generating function is tanh(log(1+x)).at n=12A009775
• Denominators of Taylor series for exp(x)*cos(x).at n=12A046981
• Square array read by antidiagonals of number of ways of dividing n*k labeled items into n labeled boxes with k items in each box.at n=26A060538
• Denominators in power series for cos(x)*cosh(x).at n=3A067630
• Denominators used in the computation of the column sequences of array A078739 ((2,2)-Stirling2).at n=12A089512
• Table T(n,k), 0<=k, 0<=n, read by antidiagonals, defined by T(n,k) = (k*n)! / (n!)^k.at n=38A089759
• a(n) = n! / 2^floor(n/2).at n=12A090932
• a(n) = n(n-1)(n-3)(n-6)...(n-t), where t is the largest triangular number less than n; number of factors in the product is ceiling((sqrt(1+8*n)-1)/2).at n=20A094261
• Triangle T(n,k) of number of loopless multigraphs with n labeled edges and k labeled vertices and without isolated vertices, n >= 1; 2 <= k <= 2*n.at n=35A122193
• Denominators associated with Taylor series expansion of inverse error function. See A092676 for numerators and further information.at n=6A132467
• Diagonal of polygorial array T(n,k) = n-th polygorial for k = n, for n > 2.at n=3A133401
• Triangle T, read by rows, such that row n equals column 0 of matrix power M^n where M is a triangular matrix defined by M(k+m,k) = binomial(k+m,k) for m=0..2 and zeros elsewhere. Width-2-restricted finite functions.at n=48A141765
• Triangle T, read by rows, such that row n equals column 0 of matrix power M^n where M is a triangular matrix defined by M(k+m,k) = binomial(k+m,k) for m=0..2 and zeros elsewhere. Width-2-restricted finite functions.at n=47A141765
• Triangle t(n,m) = (n*m)!/(m!^n) read by rows, 0<=m<=n.at n=23A141906
• Triangle T(n,k) read by rows: number of k-lists (ordered k-sets) of disjoint 2-subsets of an n-set, n>1, 0<k<=floor(n/2).at n=34A157018
• Triangle T(n,k) read by rows: number of k-lists (ordered k-sets) of disjoint 2-subsets of an n-set, n>1, 0<k<=floor(n/2).at n=35A157018
• Number of 2*n X n 0..1 arrays with row sums 5 and column sums 10.at n=5A172547
• Number of 6*n X 12 0..1 arrays with row sums 2 and column sums n.at n=0A172599