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A012543 sec(sinh(x)*arcsin(x))=1+12/4!*x^4+240/6!*x^6+15120/8!*x^8... 0
1, 0, 12, 240, 15120, 1355520, 182229696, 33914060544, 8338432876800, 2621544212398080, 1025337444571630592, 488344333262321119232, 278250960368816815149056, 186888075247900824522915840 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sec[Sinh[x]ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Apr 13 2015 *)

CROSSREFS

Sequence in context: A174556 A012349 A012302 * A012350 A220216 A126687

Adjacent sequences:  A012540 A012541 A012542 * A012544 A012545 A012546

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified February 21 03:06 EST 2019. Contains 320364 sequences. (Running on oeis4.)