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A013200 log(sec(x)+arctanh(x))=x+1/3!*x^3+13/5!*x^5-48/6!*x^6+677/7!*x^7... 0
0, 1, 0, 1, 0, 13, -48, 677, -4480, 54937, -471680, 6248713, -65916928, 988579109, -12514310144, 212756765101, -3159842455552, 60179200959793, -1026648500830208, 21632158018229009, -416691460525064192 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Log[Sec[x]+ArcTanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 21 2014 *)

CROSSREFS

Sequence in context: A288746 A220707 A189349 * A156694 A080171 A303680

Adjacent sequences:  A013197 A013198 A013199 * A013201 A013202 A013203

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Zero prepended to terms by Harvey P. Dale, Jan 21 2014

STATUS

approved

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Last modified May 9 19:47 EDT 2021. Contains 343746 sequences. (Running on oeis4.)