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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
OFFSET
0,2
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
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved