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A015056
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q-Catalan numbers (binomial version) for q=-2.
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0
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1, 1, 5, 77, 5117, 1291677, 1333581405, 5441592632541, 89331571319228381, 5848755670855706968541, 1533967407742898704050818525, 1608089383785066648192844419233245
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = {1 / (n+1)_q} {2 n choose n}_q.
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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