elrejunte
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Improve combinatorics section
Catalan Numbers
Number of BST of N nodes = Catalan(N) Number of Binary Trees of N nodes = Catalan(N)*(N!)
Stirling Numbers
- Add formula and meaning for Stirling Numbers of second type
- Add formula for Stirling Numbers parity.
Bell Number
- Add formula for Bell number and its relation with Stirling Numbers.