Catalan numbers/Pascal's triangle: Difference between revisions
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if x-y<y then y=x-y; _=1; do j=x-y+1 to x; _=_*j; end; return _/!(y)</lang> |
if x-y<y then y=x-y; _=1; do j=x-y+1 to x; _=_*j; end; return _/!(y)</lang> |
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'''output''' is the same as the 1<sup>st</sup> version. <br><br> |
'''output''' is the same as the 1<sup>st</sup> version. <br><br> |
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=={{header|Ring}}== |
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<lang ring> |
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n=15 |
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cat = list(n+2) |
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cat[1]=1 |
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for i=1 to n |
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for j=i+1 to 2 step -1 |
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cat[j]=cat[j]+cat[j-1] |
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next |
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cat[i+1]=cat[i] |
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for j=i+2 to 2 step -1 |
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cat[j]=cat[j]+cat[j-1] |
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next |
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see "" + (cat[i+1]-cat[i]) + " " |
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next |
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</lang> |
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Output: |
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<pre> |
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1 2 5 14 42 132 429 1430 4862 16796 58786 208012 742900 2674440 9694845 |
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</pre> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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