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A009719
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Expansion of tan(tanh(x))/cos(x).
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0
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1, 3, 17, 371, 11329, 398211, 31717649, 2487281075, 257775723265, 40422383525763, 6249491749613201, 1324448178268807283, 327217658581539104833, 91010297536273890164739, 29953128179590939779490961, 11561544419017955546723388851
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tan[Tanh[x]]/Cos[x], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 08 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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