Some freely available books that I liked:
Generatingfunctionology by Herbert Wilf
Information, Physics, and Computation by Marc Mézard and Andrea Montanari
Sustainable Energy – without the hot air by David MacKay
Some freely available books that I liked:
Generatingfunctionology by Herbert Wilf
Information, Physics, and Computation by Marc Mézard and Andrea Montanari
Sustainable Energy – without the hot air by David MacKay