31614105600domain: NAppears in sequencesa(n) = n! * C(n,2).at n=10A001804Denominators of Blandin-Diaz compositional Bernoulli numbers (B^S)_1,n.at n=10A133003a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2*k)^k/2^k.at n=12A356632