149265domain: NAppears in sequencesa(n) = n*(n-1)*(n^2 + 2)/6.at n=31A071244a(n) = (4*n + 3)*(1 + 2*n^2)/3.at n=38A168574The number of ways to color the vertices of all (11) simple unlabeled graphs on 4 nodes using at most n colors.at n=14A199394