A012931 - OEIS

A012931

Tanh(tan(x)+log(x+1)) = 2*x - 1/2!*x^2 - 12/3!*x^3 + 42/4!*x^4 + 172/5!*x^5 - ...

0, 2, -1, -12, 42, 172, -2250, 896, 153384, -952688, -11282040, 209648736, 279312528, -43286799008, 318803909424, 8375677890176, -180484941598080, -918969731775232, 79664942329607808, -561407566293575168

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Tanh[Tan[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 27 2013 *)

CROSSREFS

Sequence in context: A062742 A009821 A009831 * A013159 A012590 A012291

Adjacent sequences: A012928 A012929 A012930 * A012932 A012933 A012934

KEYWORD

sign

AUTHOR

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

STATUS

approved