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A012803 arcsin(sec(x)*arctan(x))=x+2/3!*x^3+48/5!*x^5+1080/7!*x^7+112000/9!*x^9... 0
1, 2, 48, 1080, 112000, 9941120, 2204340864, 473940603136, 177280211177472, 70742192264802304, 40258836839175946240, 25560794070720075464704, 20755313571874776988942336, 19066653840381485832858304512 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcSin[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 27 2013 *)

CROSSREFS

Sequence in context: A009670 A024236 A119703 * A135394 A010046 A013517

Adjacent sequences:  A012800 A012801 A012802 * A012804 A012805 A012806

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified March 3 04:26 EST 2021. Contains 341756 sequences. (Running on oeis4.)