2735775domain: NAppears in sequencesNumber of permutations in the symmetric group S_n that have even order.at n=10A059838a(n) is the number of permutations in the symmetric group S_n that contain an odd cycle.at n=10A087137a(n) = n! - ((n-1)!!)^2.at n=8A088979a(n) = (2*n)! - ((2*n-1)!!)^2.at n=5A151816