For enumerative combinatorics, it's hard to beat Sloane's Online Encyclopedia of Integer Sequences.
It is what it says on the tin. A huge list of integer sequences, with references, links, formulas, and comments.
For enumerative combinatorics, it's hard to beat Sloane's Online Encyclopedia of Integer Sequences.
It is what it says on the tin. A huge list of integer sequences, with references, links, formulas, and comments.