Ordinary Generating Function OGF) {any a0,a1,a2,·· generating function: G()=∑anxn m=0 =a0+a1x+a2x2+.Ordinary Generating Function (OGF) G(x) = ￾ ￾ n=0 anxn = a0 + a1x + a2x2 + ··· {a a0, a1, a2,... n} generating function: