617512896000domain: NAppears in sequencesa(1) = 1, a(n) = a(n-1) times smallest divisor of n >= n^(1/2).at n=17A072489a(n)=Max{ (i+j)!/i!^2 | 0<=i,j<=n }.at n=13A096769Number of minimum total dominating sets in the n-triangular (Johnson) graph.at n=15A304561