Catalan numbers/Pascal's triangle: Difference between revisions

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===Composition of pure functions===
Note that sequence [http://[oeis.org/:A000108 |A000108] ] on OEIS (referenced in the task description) confirms that the first four Catalan numbers are indeed 1, 1, 2, 5 ...
 
(Several scripts on this page appear to lose the first 1).
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