This video explores one derivation of the Catalan number formula, using the deposits and loan in bank problem earlier. Although Catalan is a language, here, Catalan numbers mean a specific class of numbers in combinatorics named after a French-Belgian mathematician Catalan.

Useful links:
https://oeis.org/wiki/Self-avoiding_w...
http://mathworld.wolfram.com/RamseyNu...
https://en.wikipedia.org/wiki/Ramsey%...

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