3 ms·

And, if you want to know more about generating functions, you can check out the book "generatingfunctionology" by the recently late Herbert Wilf gratis at http:

And, if you want to know more about generating functions, you can check out the book "generatingfunctionology" by the recently late Herbert Wilf gratis at http://www.math.upenn.edu/~wilf/DownldGF.html http://www.math.upenn.edu/~wilf/DownldGF.html

tmoertel 13y ago
Another great resource on generating functions is Analytic Combinatorics by Philippe Flajolet and Robert Sedgewick: http://algo.inria.fr/flajolet/Publications/book.pdf http://algo.inria.fr/flajolet/Publications/book.pdf