Reference request: comprehensive handbook of combinatorial formulae I am searching for an handbook that collects a comprehensive list of formulae in combinatorics. Could you point out one such reference?

There is no such thing as a "comprehensive list of formulae in combinatorics". But there are some useful resources. Henry W Gould's homepage; John Riordan's book, Combinatorial Identities; Ken Rosen's Handbook of Discrete and Combinatorial Mathematics; Comtet's Advanced Combinatorics; Handbook of Combinatorics by Graham et al.