3715891200

Appears in sequences

• Double factorial of even numbers: (2n)!! = 2^n*n!.at n=10A000165
• Sorted list of orders of Weyl groups of types A_n, B_n, D_n, E_n, F_4, G_2.at n=33A001217
• Double factorials n!!: a(n) = n*a(n-2) for n > 1, a(0) = a(1) = 1.at n=20A006882
• Order of group generated by perfect shuffles of 2n cards.at n=9A007346
• Smallest k such that k*n is a double factorial.at n=21A007919
• Denominators in the Taylor expansion exp(cosec(x)-cot(x))=1 + x/2 + x^2/8 + x^3/16 + 3*x^4/128 + 37*x^5/3840 + 59*x^6/15360 + ...at n=10A013516
• Number of subgroups L of Z^n with the property that for every a in Z^n there exists precisely one b in L with d(a,b) <= 1. Here d denotes Euclidean distance.at n=11A026739
• Number of solutions to non-attacking rooks problem on n X n board that are invariant under 180-degree rotation.at n=20A037223
• Number of solutions to non-attacking rooks problem on n X n board that are invariant under 180-degree rotation.at n=21A037223
• 4*Denominator of S(n)/Pi^n, where S(n) = Sum_{k=-inf..+inf} ((4k+1)^(-n)).at n=10A050971
• E.g.f. (1+x^2-2x^3)/(1-2x).at n=10A052576
• Expansion of e.g.f. (1 + x^3 - 2*x^4)/(1-2*x).at n=10A052694
• Denominators in the series for Bessel function J10(x).at n=0A061441
• a(n) = 2^(2*n)*(2*n)!.at n=5A067624
• Terms of A110142 at positions p(n)+1, where p(n) = A000041(n) is the number of partitions of n; a(n) = A110142(p(n)+1) for n>=1, with a(0) = 1.at n=19A110144
• Triangle: No(x, n) = (2*n/x)*No(x, n - 1) + (-n/(n - 2))*No( x, n - 2) + Ceiling[(2*(n - 1)/((n - 2)))*Sin[(n - 1)*Pi/2]]/x; weighted by 2*x^(n + 1).at n=50A137384
• Denominators of expansion of exp(1-sqrt(1-x-2*x^2)).at n=10A144578
• Denominators of expansion of exp(1-sqrt(1-x-x^2)).at n=10A144580
• A sequence related to the Beta function.at n=5A162445
• a(n) = Product_{k in M_n} k; M_n = {k | 1 <= k <= 2n and k mod 2 = n mod 2}.at n=10A190901