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Task/Catalan-numbers/K/catalan-numbers.k
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Task/Catalan-numbers/K/catalan-numbers.k
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catalan: {_{*/(x-i)%1+i:!y-1}[2*x;x+1]%x+1}
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catalan'!:15
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1 1 2 5 14 42 132 429 1430 4862 16796 58786 208012 742900 2674440
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