45745domain: NAppears in sequencesa(n) is the solution to the postage stamp problem with 6 denominations and n stamps.at n=19A001211a(n) = (2*n^3 + 5*n^2 - 11*n)/2.at n=34A162257Solution of the complementary equation a(n) = a(n-1) + a(n-2) + 2*b(n-1) + b(n-2), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=17A294420