40874803200
domain: N
Appears in sequences
- a(n) = 4^n*(2*n+1)!.at n=5A002671
- a(0) = 1; for n > 0, a(n) = 2^(n-1)*n!.at n=11A002866
- Order of group generated by perfect shuffles of 2n cards.at n=10A007346
- Expansion of log(1+x)/cosh(log(1+x)).at n=16A009430
- Number of reversible strings with n labeled beads of 2 colors.at n=10A032107
- a(n) = (2*n+6)!!/6!!, related to A000165 (even double factorials).at n=9A051580
- E.g.f. x(1+x-2x^2)/(1-2x).at n=11A052594
- E.g.f. x*(1+2x-4x^2)/(1-2x).at n=11A052656
- Triangle of coefficients of x^2 in the Neumann polynomials.at n=36A057869
- a(n) = (n+1)*a(n-2) with a(0) = a(1) = 1.at n=21A081405
- Denominators of the coefficients of a power series for the canonical half-exponential function.at n=21A091737
- Denominators of the coefficients of a power series for the canonical half-exponential function.at n=23A091737
- a(n) is the product of the positive integers each of which is <= n and is divisible by exactly one prime dividing n (but is coprime to every other prime dividing n). (a(1) = 1).at n=21A119794
- Row sums of triangle in A066094.at n=11A121892
- Denominators of numbers with g.f. exp(1-(1-x)^(1/2)).at n=11A143968
- Denominators of expansion of exp(1-sqrt(1-x-2*x^2)).at n=11A144578
- Column 1 of the triangular array at A249057.at n=19A249060
- Number of automorphisms in the n-halved cube graph.at n=10A288944
- Number of automorphisms of the n-folded cube graph.at n=9A357827
- Number of Wachs permutations of size n.at n=21A359039