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A012823
arcsin(sec(x)*arcsinh(x))=x+3/3!*x^3+53/5!*x^5+1855/7!*x^7...
0
1, 3, 53, 1855, 156425, 19537595, 3987121981, 1087120051511, 408148372272017, 193531749818796403, 116081047496759766725, 84538055378229508493871, 74205177566923695709271961
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[ArcSin[Sec[x]ArcSinh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Nov 04 2024 *)
CROSSREFS
Sequence in context: A216931 A352992 A012742 * A098932 A100444 A300420
KEYWORD
nonn,changed
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved