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A012238
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cosh(arctan(arctanh(x)))=1+1/2!*x^2+1/4!*x^4+49/6!*x^6+1345/8!*x^8...
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0
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1, 1, 1, 49, 1345, 105441, 10336833, 1580651409, 316289380737, 83559601907649, 27709107620492673, 11345006679686949105, 5605389007592066373825, 3292126822668986935347105, 2265914784466771293436282305, 1806802766658673683522189272145
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Cosh[ArcTan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 02 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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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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