741354768000domain: NAppears in sequencesProduct of the numbers from (n-1)^2+1 to n^2.at n=4A091777Number of arrangements that can be formed by taking n distinct things out of 25.at n=9A104643a(n) = n! / floor(2n/3)!.at n=25A374647a(n) = Product_{k=0..n-1} (2*n+k-1).at n=9A384261