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A289719
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a(n) = (n/2)*binomial(2*n, n) + 1.
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2
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1, 2, 7, 31, 141, 631, 2773, 12013, 51481, 218791, 923781, 3879877, 16224937, 67603901, 280816201, 1163381401, 4808643121, 19835652871, 81676217701, 335780006101, 1378465288201, 5651707681621, 23145088600921, 94684453367401, 386971244197201, 1580132580471901
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OFFSET
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0,2
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LINKS
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FORMULA
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MAPLE
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seq(1+n/2*binomial(2*n, n), n=0..20) ;
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MATHEMATICA
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PROG
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(GAP)
(PARI) a(n) = {n*binomial(2*n, n)/2 + 1} \\ Andrew Howroyd, Apr 26 2020
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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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EXTENSIONS
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STATUS
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approved
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