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A013459
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Expansion of e.g.f. exp(arctan(x) - log(x+1)).
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1
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1, 0, 1, -4, 9, -40, 385, -2700, 15505, -145360, 1886625, -19796500, 190881625, -2654379000, 44269902625, -625468889500, 8553276590625, -156119043652000, 3194978818578625, -57041478987070500
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OFFSET
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0,4
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LINKS
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FORMULA
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E.g.f.: exp(arctan(x) - log(x+1)).
(n+1)^2*(n+2)*a(n)+n*(n+2)*a(n+1)+(n+2)*a(n+2)+a(n+3) = 0. (End)
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MAPLE
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f:= gfun:-rectoproc({(n+1)^2*(n+2)*a(n)+n*(n+2)*a(n+1)+(n+2)*a(n+2)+a(n+3) = 0, a(0)=1, a(1)=0, a(2)=1}, a(n), remember):
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Exp[ArcTan[x]-Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 03 2011 *)
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PROG
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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