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A123332
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a(n) = 2^n*(Gamma(n+1/2)/Gamma(1/2) + (n-1)!).
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1
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3, 7, 31, 201, 1713, 18075, 227295, 3317265, 55103265, 1026318195, 21181092975, 479733356025, 11829834687825, 315481555464075, 9046941599670975, 277598531343758625, 9075051786962786625, 314884420627497595875, 11557482238066613223375, 447385119579169194047625
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OFFSET
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1,1
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COMMENTS
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The EXP-transform of a(n) is equal to A121629(n).
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LINKS
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FORMULA
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E.g.f.: (1-2*x)^(-1/2) - 1 - log(1-2*x).
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MATHEMATICA
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Table[2^n*(Gamma[n + 1/2]/Gamma[1/2] + (n - 1)!), {n, 0, 50}] (* G. C. Greubel, Oct 04 2017 *)
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PROG
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(PARI) a(n) = round(2^n*(gamma(n+1/2)/gamma(1/2) + (n-1)!)); \\ Michel Marcus, Oct 05 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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