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A152671
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Even Catalan numbers divided by 2.
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1
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1, 7, 21, 66, 715, 2431, 8398, 29393, 104006, 371450, 1337220, 17678835, 64822395, 238819350, 883631595, 3282060210, 12233133510, 45741281820, 171529806825, 644952073662, 2430973200726, 9183676536076, 34766775458002
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) lista(nn) = for (n=1, nn, if (((c=binomial(2*n, n)/(n+1)) % 2) == 0, print1(c/2, ", "))); \\ Michel Marcus, Nov 02 2015
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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