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A009389 Expansion of log(1+tanh(x))*cosh(x). 1

%I

%S 0,1,-1,3,-4,5,-1,7,-64,9,1319,11,-49204,13,2653559,15,-196707424,17,

%T 19194804719,19,-2385684870724,21,367985503366799,23,

%U -68980888889771104,25,15445553274667315799,27,-4071626956018456576564,29

%N Expansion of log(1+tanh(x))*cosh(x).

%t With[{nn=30},CoefficientList[Series[Log[1+Tanh[x]]*Cosh[x],{x,0,nn}], x]Range[0,nn]!] (* _Harvey P. Dale_, Mar 09 2012 *)

%Y From _Johannes W. Meijer_, May 24 2009: (Start)

%Y The a(2*n) sequence equals the second left hand column of A160485 divided by two.

%Y (End)

%K sign,easy

%O 0,4

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997

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Last modified September 20 08:10 EDT 2021. Contains 347577 sequences. (Running on oeis4.)