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A012809
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tanh(sec(x)*arctan(x))=x-1/3!*x^3+25/5!*x^5-1209/7!*x^7+68945/9!*x^9...
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1, -1, 25, -1209, 68945, -7692881, 1181481769, -242740782153, 66317255314721, -22739603323053601, 9634203397240829625, -4937246969845634306905, 3007627322996781467655025, -2149125294837930108279760753, 1779707247211878394671148764873
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listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=40}, Take[CoefficientList[Series[Tanh[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 29 2013 *)
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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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