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A009722
Expansion of tan(tanh(x)*tan(x))/2.
0
1, 176, 570496, 9223556096, 460993706622976, 55266063875773300736, 13556412676746128524312576, 6098119622978353294582319415296, 4642750780653941150969313976486199296
OFFSET
0,2
MATHEMATICA
With[{nn=40}, Take[CoefficientList[Series[Tan[Tanh[x]*Tan[x]]/2, {x, 0, nn}], x] Range[0, nn-2]!, {3, -1, 4}]] (* Harvey P. Dale, Oct 24 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested 03/97.
Name corrected by Vaclav Kotesovec, Jan 23 2015
Prior Mathematica program replaced by Harvey P. Dale, Oct 24 2017
STATUS
approved