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A012827 sinh(sec(x)*arcsinh(x))=x+3/3!*x^3+45/5!*x^5+1071/7!*x^7+56697/9!*x^9... 0
1, 3, 45, 1071, 56697, 3279419, 376156261, 35274762407, 8003761282417, 853554115621363, 450081179390735645, 17369944484313961631, 62576187908645427074025, -11407841475969056406389973 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sinh[Sec[x]ArcSinh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 08 2018 *)

CROSSREFS

Sequence in context: A154289 A171080 A188681 * A012769 A302106 A241242

Adjacent sequences:  A012824 A012825 A012826 * A012828 A012829 A012830

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 16 13:24 EDT 2021. Contains 348042 sequences. (Running on oeis4.)