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A003700
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Expansion of tan(x /cosh(x)).
(Formerly M5080)
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3
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1, -1, -19, 475, 1753, -1109769, 70784325, 2711086547, -1376283649103, 148592152807663, 21812320857733789, -12754009647903010101, 1675171082535404962441, 847081835857552788679655
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OFFSET
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0,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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MATHEMATICA
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Tan[ x/Cosh[ x ] ] (* Odd Part *)
nn = 20; Table[(CoefficientList[Series[Tan[x*Sech[x]], {x, 0, 2*nn+1}], x] * Range[0, 2*nn+1]!)[[n]], {n, 2, 2*nn, 2}] (* Vaclav Kotesovec, Feb 16 2015 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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