Catalan numbers: Difference between revisions
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→{{header|Oforth}}
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=={{header|Oforth}}==
<lang Oforth>: catalan(
n ifZero: [ 1 ] else: [ catalan( n 1- ) 2 n * 1- * 2 * n 1+ / ] ;</lang>
{{out}}
<pre>
import: mapping
seqFrom(0, 15) map( #catalan ) .
[1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845]
</pre>
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