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A024257 Expansion of tanh(tan(x)*x)/2. 1

%I #9 Apr 02 2017 15:31:07

%S 0,1,4,-72,-5632,-161920,18173952,4194147328,310213328896,

%T -84365860995072,-39813939519815680,-5549928926785306624,

%U 2813587774502929956864,2234702652489178135134208,497733049858403607865458688

%N Expansion of tanh(tan(x)*x)/2.

%t With[{nn=30},Take[CoefficientList[Series[Tanh[Tan[x]*x]/2 ,{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Apr 27 2016 *)

%Y Cf. A009817.

%K sign

%O 0,3

%A _R. H. Hardin_

%E Extended with signs Mar 1997

%E Prior Mathematica program deleted by _Harvey P. Dale_, Apr 27 2016

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Last modified July 19 17:03 EDT 2024. Contains 374410 sequences. (Running on oeis4.)