A012399 - OEIS

A012399

arctan(arctan(x)*log(x+1))=2/2!*x^2-3/3!*x^3-10/5!*x^5-32/6!*x^6...

0, 0, 2, -3, 0, -10, -32, 1596, -10080, 27936, -19008, -4728240, 113762880, -1378522080, 12151639680, -24566643360, -3018767431680, 84947924490240, -1424022331422720, 18489594521756160, -42627235124920320

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[ArcTan[ArcTan[x]*Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Ray Chandler, Nov 28 2016 *)

CROSSREFS

Sequence in context: A336083 A256294 A279412 * A012403 A012655 A012650

Adjacent sequences: A012396 A012397 A012398 * A012400 A012401 A012402

KEYWORD

sign

AUTHOR

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

STATUS

approved