980995276800
domain: N
Appears in sequences
- a(0) = 1; for n > 0, a(n) = 2^(n-1)*n!.at n=12A002866
- Number of reversible strings with n labeled beads of 2 colors.at n=11A032107
- E.g.f. x(1+x-2x^2)/(1-2x).at n=12A052594
- E.g.f. x*(1+2x-4x^2)/(1-2x).at n=12A052656
- Unrelated-factorial numbers: product of numbers unrelated to n (numbers which have a common divisor with n but do not divide n).at n=25A070251
- a(n) = (n+1)*a(n-2) with a(0) = a(1) = 1.at n=23A081405
- Row sums of triangle in A066094.at n=12A121892
- Column 1 of the triangular array at A249057.at n=21A249060
- A bisection of A002866.at n=6A274304
- Number of automorphisms in the n-halved cube graph.at n=11A288944
- Number of automorphisms of the n-folded cube graph.at n=10A357827
- Number of Wachs permutations of size n.at n=23A359039