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A013451
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E.g.f.: exp(tan(x)-tanh(x))=1+4/3!*x^3+160/6!*x^6+544/7!*x^7+17920/9!*x^9...
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0
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1, 0, 0, 4, 0, 0, 160, 544, 0, 17920, 261120, 707584, 3942400, 149360640, 1538068480, 5242548224, 111522611200, 2782416732160, 25458261360640, 166243180478464, 5279051703910400, 109528131284500480
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OFFSET
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0,4
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LINKS
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Table of n, a(n) for n=0..21.
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Exp[Tan[x]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 19 2013 *)
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CROSSREFS
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Sequence in context: A351156 A358292 A071608 * A013462 A326862 A222325
Adjacent sequences: A013448 A013449 A013450 * A013452 A013453 A013454
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KEYWORD
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nonn
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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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Definition clarified by Harvey P. Dale, Jun 19 2013
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STATUS
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approved
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