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A013181 Expansion of e.g.f.: log(arctanh(x)+cos(x)) = x-2/2!*x^2+7/3!*x^3-28/4!*x^4+193/5!*x^5... 0
0, 1, -2, 7, -28, 193, -1400, 13319, -139424, 1721281, -23379712, 357281351, -5951323904, 108706678273, -2142923081728, 45591739883975, -1037606714249216, 25211971076762753, -650452080060399616 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..18.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Log[ArcTanh[x]+Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 12 2016 *)

CROSSREFS

Sequence in context: A334613 A123026 A013011 * A191478 A321181 A122118

Adjacent sequences:  A013178 A013179 A013180 * A013182 A013183 A013184

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Zero prepended and definition clarified by Harvey P. Dale, Jan 12 2016

STATUS

approved

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)