A012990 - OEIS

A012990

sinh(arctan(x)+arcsin(x))=2*x+7/3!*x^3+25/5!*x^5+1985/7!*x^7...

2, 7, 25, 1985, 14905, 9006925, 20012525, 202749678625, -3158018147375, 14186901874647125, -671237145329976875, 2393939114315833215625, -224442506249023480234375, 829987864326478226455328125

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OFFSET

0,1

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sinh[ArcTan[x]+ArcSin[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 13 2017 *)

CROSSREFS

Sequence in context: A339515 A323658 A018980 * A137102 A294681 A229241

Adjacent sequences: A012987 A012988 A012989 * A012991 A012992 A012993

KEYWORD

sign

AUTHOR

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

STATUS

approved