05Axx Classical combinatorial problems

05A05  Combinatorial choice problems (subsets, representatives, 
             permutations)
05A10  Factorials, binomial coefficients, combinatorial functions,
               See also {11B65, 33Cxx}
05A15  Exact enumeration problems, generating functions, See Also
               {33Cxx, 33Dxx}
05A16  Asymptotic enumeration
05A17  Partitions of integers, See also {11P81,  11P82,  11P83}
05A18  Partitions of sets
05A19  Combinatorial identities
05A20  Combinatorial inequalities
05A30  $q$-calculus and related topics, See also {03Dxx}
05A40  Umbral calculus
05A99  None of the above but in this section