A012795 arcsin(sec(x)*tan(x))=x+6/3!*x^3+120/5!*x^5+6216/7!*x^7+652800/9!*x^9...

1, 6, 120, 6216, 652800, 115944576, 31101732480, 11717149191936, 5895158281052160, 3816842537847607296, 3090738173477544099840, 3060041827367678200774656, 3636490261219371329053163520

Offset

0,2

Links

Table of n, a(n) for n=0..12.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSin[Sec[x]Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jul 18 2013 *)

Crossrefs

Sequence in context: A012846 A331640 A012641 * A054479 A012475 A053777

Adjacent sequences: A012792 A012793 A012794 * A012796 A012797 A012798

Keyword

nonn

Author

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

Status

approved