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A012846 sinh(sec(x)*arctanh(x))=x+6/3!*x^3+120/5!*x^5+5376/7!*x^7... 0
1, 6, 120, 5376, 415104, 48143744, 7784817664, 1673986906112, 462531126525952, 159859054841331712, 67616604530628853760, 34373912421215807799296, 20685291456673100857344000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sinh[Sec[x]ArcTanh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 22 2014 *)

CROSSREFS

Sequence in context: A094278 A093910 A002370 * A331640 A012641 A012795

Adjacent sequences:  A012843 A012844 A012845 * A012847 A012848 A012849

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified October 21 08:06 EDT 2021. Contains 348150 sequences. (Running on oeis4.)