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A012794 sech(sec(x)*arcsin(x))=1-1/2!*x^2-11/4!*x^4-85/6!*x^6+4457/8!*x^8... 0
1, -1, -11, -85, 4457, 456055, 19404317, -2130838749, -709981721647, -88561132771729, 8928572938556485, 8215826370826826011, 1643974395579178155321, -777302111773052397223705, -927256122029195944220743571, -491644215408419904657774637165 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..15.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sech[Sec[x]ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 25 2015 *)

CROSSREFS

Sequence in context: A129180 A082365 A320940 * A302954 A014917 A080962

Adjacent sequences:  A012791 A012792 A012793 * A012795 A012796 A012797

KEYWORD

sign

AUTHOR

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

EXTENSIONS

More terms from Harvey P. Dale, Mar 25 2015

STATUS

approved

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Last modified October 16 23:30 EDT 2019. Contains 328103 sequences. (Running on oeis4.)