1 1 3 5 7 10 14 19 25 32 42 53 66 82 101 124 150 181 216 257 306 Start at the 0th coin. The value of the nth coin is the number of ways to make change for n cents in earlier coins. The two penny coins are considered distinct. g.f: g(x) = PROD(n >= 0; 1/(1-x^a(n))) - x