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A024342 E.g.f. tanh(x)*tan(x), coefficients of powers x^(4*n+2). 2

%I

%S 2,112,92672,365688832,4411282030592,127206964253949952,

%T 7496936195881447718912,809926025985929119868649472,

%U 148071124873925782667263194693632,43087047288444223765736160658186043392,19011875896715283767147325248912471990730752

%N E.g.f. tanh(x)*tan(x), coefficients of powers x^(4*n+2).

%t With[{nn=40},Take[CoefficientList[Series[Tanh[x]Tan[x],{x,0,nn}], x] Range[0,nn-2]!,{3,-1,4}]] (* _Harvey P. Dale_, May 02 2012 *)

%K nonn

%O 0,1

%A _R. H. Hardin_

%E Extended and signs tested Mar 15 1997 by _Olivier GĂ©rard_.

%E More terms from Harvey P. Dale, May 02 2012

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)