Todo
Short blurb about species
Proofread / point to the main classes rather than the modules?
Enumeration of trees using generating functions
Species, decomposable combinatorial classes
Streams or Infinite Arrays
Series Order
Lazy Power Series
Generating Series
Combinatorial Species
Empty Species
Recursive Species
Characteristic Species
Cycle Species
Partition Species
Permutation species
Linear-order Species
Set Species
Subset Species
Examples of Combinatorial Species
Sum species
Composition species
Functorial composition species
Species structures
Miscellaneous Functions
Functions that compute some of the sequences in Sloane’s tables
Combinatorial species features that are imported by default in the interpreter namespace