17244057600domain: NAppears in sequencesa(n) = 3*n*n!.at n=12A052673a(1) = 1, a(2) = 2; for n>2, a(n) = 3*(n-2)*(n-2)!.at n=13A083746Number of even entries that are followed by a smaller entry in all permutations of {1,2,...,n}.at n=12A145889a(n) = floor(n^2/4)*n!.at n=12A306258