65840947200
domain: N
Appears in sequences
- Order of the subgroup of the symmetric group S_(2n) generated by the 2 cycles: (1,2,...n,2n,2n-1,...,n+1) and (1,2,...,2n).at n=7A070740
- a(n) = (n!)^2/2.at n=7A123385
- a(n) is the denominator of Sum_{k=0..n} 1 / (k!)^2.at n=9A354303
- Number of even parity alternating permutations of [1..n] starting with an odd integer.at n=18A364849
- Maximum possible product of differences of every pair in a set of nonnegative integers with sum n.at n=27A382328