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A013428 sec(arcsin(x)-tanh(x))=1+90/6!*x^6-1176/8!*x^8+185094/10!*x^10... 0
1, 0, 0, 90, -1176, 185094, 5520372, 1212373162, 360563171248, 54782671966798, 28420007004983564, 9501613654091931218, 4976784878396711868488, 2978748297366502676647350 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sec[ArcSin[x]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 17 2013 *)

CROSSREFS

Sequence in context: A048548 A013427 A013425 * A013429 A008449 A213455

Adjacent sequences:  A013425 A013426 A013427 * A013429 A013430 A013431

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified January 17 22:33 EST 2022. Contains 350410 sequences. (Running on oeis4.)