A012403 - OEIS

A012403

E.g.f. tanh(arctan(x)*log(x+1))

2, -3, 0, -10, -32, 1596, -10080, 27936, -260928, 1924560, 33929280, -686630880, 4846421760, -42426084960, 778331473920, -1890071554560, -216298842931200, 4070252020032000, -41366803088056320

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

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..20.

EXAMPLE

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

MATHEMATICA

With[{nn=20}, Drop[CoefficientList[Series[Tanh[ArcTan[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!, 2]] (* Harvey P. Dale, Feb 28 2012 *)

CROSSREFS

Sequence in context: A256294 A279412 A012399 * A012655 A012650 A111606

Adjacent sequences: A012400 A012401 A012402 * A012404 A012405 A012406

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Offset corrected by Harvey P. Dale, Feb 28 2012

STATUS

approved