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A012416 arctanh(atan(x)*exp(x))=x+2/2!*x^2+3/3!*x^3+20/4!*x^4+173/5!*x^5... 0
1, 2, 3, 20, 173, 1190, 11039, 140968, 1855481, 26494858, 441706331, 8105309500, 159190672613, 3403623626286, 78823813121975, 1949180731782480, 51354602068725361, 1439864769232356882 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

MATHEMATICA

Rest[With[{nn=25}, CoefficientList[Series[ArcTanh[ArcTan[x]Exp[x]], {x, 0, nn}], x]Range[0, nn]!]] (* Harvey P. Dale, Oct 21 2011 *)

CROSSREFS

Sequence in context: A009721 A013340 A218873 * A177946 A006246 A110372

Adjacent sequences:  A012413 A012414 A012415 * A012417 A012418 A012419

KEYWORD

nonn

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified April 23 13:33 EDT 2014. Contains 240928 sequences.