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===extracting Catalan numbers from Pascal's triangle===
As I understand this task's requirements, the Catalan numbers are to be extracted from Pascal's triangle (and therefore, not be directly computed via binomial coefficients or some other means). Should programming solutions that ''don't'' extract Catalan numbers from Pascal's triangle be flagged as incorrect? -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 18:50, 20 October 2014 (UTC)
- The task description references http://milan.milanovic.org/math/english/fibo/fibo4.html. Both references to the Pascal triangle are like the first one, which observes in effect that the Catalan numbers can be computed as C(2n;n) - C(2n; n-1). Therefore it seems to me that the question asked by Gerard
ShildbergerSchildberger is ill-framed. That is, specific equations using binomial coefficients are admissible if their connection with Pascal's triangle is established. [[User:Peak|Peak]] ([[User talk:Peak|talk]]) 19:14, 20 October 2014 (UTC)
:: I don't know how to frame my question other than how I phrased it. However, I've added a REXX version that computes Catalan numbers using binomial coefficients. If binomial coefficients are OK to use, then why was the phrase used ''... extracting them from Pascal's triangle''? Using binomial coefficients are of course, much cleaner/simpler/faster than computing elements of Pascal's triangle. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 21:32, 20 October 2014 (UTC)
- for info : dead link : http://milan.milanovic.org/math/english/fibo/fibo4.html --[[User:G.Brougnard|G.Brougnard]] ([[User talk:G.Brougnard|talk]]) 14:07, 9 November 2015 (UTC)