Catalan numbers/Pascal's triangle: Difference between revisions
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1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845 |
1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845 |
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</pre> |
</pre> |
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=={{header|Common Lisp}}== |
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<lang Lisp>(defun catalan (n) |
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"Return the n-th Catalan number" |
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(if (<= n 1) 1 |
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(let ((result 2)) |
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(dotimes (k (- n 2) result) |
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(setq result (* result (/ (+ n k 2) (+ k 2)))) )))) |
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(dotimes (n 15) |
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(print (catalan (1+ n))) )</lang> |
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{{out}} |
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<pre>1 |
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2 |
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5 |
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14 |
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42 |
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132 |
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429 |
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1430 |
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4862 |
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16796 |
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58786 |
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208012 |
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742900 |
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2674440 |
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9694845</pre> |
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=={{header|D}}== |
=={{header|D}}== |
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