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Generatingfunctionology, 3rd ed, Herbert S. Wilf, Boston: Academic Press, 2016, ISBN13: 978-1-5688-1279-3 An electronic copy of the 2nd edition is freely available here. |
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Combinatorics and Graph Theory, John M. Harris, Jeffry L. Hirst, Michael J. Mossinghoff, Springer 2008, Chapters 1-2,
ISBN13: 978-0-3877-9711-3 An electronic copy is freely available here. |
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Enumerative Combinatorics I, 2nd ed., Richard Stanley, Cambridge 2012, ISBN13: 978-1-107-01542-5 An electronic copy is freely available here. |
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Analytic Combinatorics, Flajolet and Sedgewick, Cambridge University Press 2009 An electronic copy is freely available from the authors' homepage here or via the MSU library here. |
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Combinatorics: The Art of Counting, Bruce Sagan, American Mathematical Society 2020 A preliminary version is freely available from the authors' homepage here. |