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A012822
sin(sec(x)*arcsinh(x))=x+1/3!*x^3+5/5!*x^5-499/7!*x^7-12055/9!*x^9...
0
1, 1, 5, -499, -12055, -2156871, -24423763, -27205910523, 2396435716433, -1214149548475407, 375616253471952085, -173184506373765285763, 93896424495536603892025, -57465007424690895944339543
OFFSET
0,3
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[Sec[x]ArcSinh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 17 2023 *)
CROSSREFS
Sequence in context: A308132 A352181 A152513 * A124358 A198719 A198910
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved