There's also http://algo.inria.fr/flajolet/Publications/book.pdf http://algo.inria.fr/flajolet/Publications/book.pdf. The first chapter of this book is more or

There's also http://algo.inria.fr/flajolet/Publications/book.pdf http://algo.inria.fr/flajolet/Publications/book.pdf. The first chapter of this book is more or less equivalent to generatingfunctionology, but has a more modern flavour.