# Enumerative Combinatorics
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- binomial coefficient
- Pascal's tiangle
- Vandermonde's convolution
- binary string
- Dyck word
- k-are necklace
- Catalan numbers
- Fibonacci numbers
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Eulerian numbers
- Cayley's formula
- twelvefold way



- Bernoulli numbers
- Stirling numbers


1. Combinatorial principles
- pidgeon hole principle
- division principle
- multiplication principle
- addition principle
- inclusion-exclusion principle
- factorial
- repetition
- permutation
- combination
- stars & bars approach
- twelvefold way
2. Generating functions
- generating function
2. Integer sequences
- Faulhaber's formula
4. Algebraic enumeration
-Burnside's lemma