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A013102
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E.g.f: sech(arcsinh(x)+tan(x))=1-4/2!*x^2+72/4!*x^4-3414/6!*x^6...
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1
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1, -4, 72, -3414, 304696, -43757114, 9229955724, -2685455642198, 1030584093889104, -504321546504212914, 306492028524272596724, -226465717137080425353646, 199935485865217931345463224
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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[Sech[ArcSinh[x]+Tan[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] Harvey P. Dale, May 17 2012
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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