239500800

Appears in sequences

• Order of alternating group A_n, or number of even permutations of n letters.at n=12A001710
• a(n) = (2n)!/2.at n=5A002674
• Denominator of 2*Stirling_2(n,2)/n!.at n=10A002679
• Denominators of coefficients for repeated integration.at n=4A002684
• Denominators of coefficients for repeated integration.at n=8A002688
• a(n) = A002034(n)!/n.at n=25A007672
• a(n) = n!*(n+5)!/5!.at n=6A010794
• Order of shuffle group for deck of 3n cards.at n=4A014525
• Number of pairs of sequences of cardinality at least 3.at n=11A052521
• a(n) = n! *((-1)^n + 2*n + 3)/4.at n=11A052558
• Expansion of e.g.f. x/((1-x)(1-x^2)).at n=11A052591
• Denominator of expected length of longest increasing subsequence of a permutation of length n.at n=12A054677
• Number of labeled trees with n nodes and 3 leaves.at n=7A055315
• a(n) = n! / {product of factorials of the digits of n}.at n=12A061603
• a(n) = n! / (number of distinct prime divisors of n).at n=10A062348
• a(n) = floor( gamma(n/4) * gamma(n+1)/4 ).at n=11A062512
• Square array read by descending antidiagonals of number of ways of dividing n*k labeled items into k unlabeled orders with n items in each order.at n=26A066991
• Let m be the product of the decimal digits in n, then a(n) = 0 if m = 0, otherwise a(n) = n!/m.at n=11A067455
• Surface area of n-dimensional sphere of radius r is n*V_n*r^(n-1) = n*Pi^(n/2)*r^(n-1)/(n/2)! = S_n*Pi^floor(n/2)*r^(n-1); sequence gives denominator of S_n.at n=26A072479
• One half of third column of triangle A075181.at n=8A075183