110004domain: NAppears in sequencesa(1) = 1, a(2) = 5, a(n+2) = 5*a(n+1) + (n + 1)^2*a(n).at n=6A142980a(n) = prime(n)^3 - prime(n^3).at n=15A262199Number of conjugacy classes of pairs of commuting elements in the alternating group A_n.at n=19A371059