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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
OFFSET
0,2
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 A361046
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved