188428domain: NAppears in sequencesa(n) = 27*(n - 6)^2 + 4*(n - 6)^3 = ((n - 6)^2)*(4*n + 3).at n=40A245032a(n) = (prime(n) - 7)^2 * (4*prime(n) - 1).at n=12A245035