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A012608 sec(arcsinh(x)*arcsin(x)) = 1+12/4!*x^4+13328/8!*x^8+117619392/12!*x^12... 0
1, 12, 13328, 117619392, 4062867095808, 388601301012237312, 83771183547685073326080, 35504181228757953494366208000, 26841389346007019483917993990225920, 33654478025536204699103406849552997416960, 66134661422427811384963352725241987600886005760 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

MATHEMATICA

With[{nn=40}, Take[CoefficientList[Series[Sec[ArcSinh[x]ArcSin[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 4}]] (* Harvey P. Dale, Apr 09 2012 *)

CROSSREFS

Sequence in context: A074983 A159413 A317958 * A012735 A012674 A301533

Adjacent sequences:  A012605 A012606 A012607 * A012609 A012610 A012611

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Harvey P. Dale, Apr 09 2012

STATUS

approved

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Last modified September 28 20:34 EDT 2022. Contains 357081 sequences. (Running on oeis4.)