A012216 - OEIS

A012216

sinh(arctan(arcsinh(x)))=x-2/3!*x^3+24/5!*x^5-664/7!*x^7+28416/9!*x^9...

1, -2, 24, -664, 28416, -942336, -260697984, 165900454656, -85943912448000, 48584004553543680, -31574321393019125760, 23832746038658540666880, -20858343927838973179822080, 21048655959583804491297914880

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OFFSET

0,2

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sinh[ArcTan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 04 2024 *)

CROSSREFS

Bisection of A012213.

Sequence in context: A193442 A123741 A302579 * A012118 A012375 A012750

Adjacent sequences: A012213 A012214 A012215 * A012217 A012218 A012219

KEYWORD

sign,changed

AUTHOR

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

STATUS

approved