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Concrete mathematics : a foundation for computer science

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364 GENERATING FUNCTIONS<br />

43 The Newtonian generating function of a sequence (gn) is defined to be<br />

Find a convolution <strong>for</strong>mula that defines the relation between sequences<br />

(fn), (gn), and (h,) whose Newtonian generating functions are related<br />

by the equation i(z)6 (z) = h(z). Try to make your <strong>for</strong>mula as simple<br />

and symmetric as possible.<br />

44 Let q,, be the number of possible outcomes when n numbers {xl,. . ,x,}<br />

are compared with each other. For example, q3 = 13 because the possibilities<br />

are<br />

Xl

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