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A009126 E.g.f.: Expansion of cosh(log(1+tanh(x))). 1
1, 0, 1, -3, 4, 0, 16, -168, 64, 3840, 256, -177408, 1024, 11182080, 4096, -951886848, 16384, 104932638720, 65536, -14544442687488, 262144, 2475749026037760, 1048576, -507711943255523328, 4194304, 123460740095095603200, 16777216 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..26.

FORMULA

E.g.f.: (1/Q(0)+Q(0))/2, where Q(k) = 1 - x/( 2*k+1 + x/Q(k+1) ); (continued fraction). - Sergei N. Gladkovskii, Dec 20 2013

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Cosh[Log[1+Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 18 2014 *)

CROSSREFS

Cf. A009570.

Sequence in context: A099447 A078067 A192442 * A102222 A171657 A287696

Adjacent sequences:  A009123 A009124 A009125 * A009127 A009128 A009129

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Previous Mathematica program replaced and definition clarified by Harvey P. Dale, May 18 2014

STATUS

approved

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Last modified February 25 18:44 EST 2018. Contains 299655 sequences. (Running on oeis4.)