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A012172
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sec(tan(tanh(x)))=1+1/2!*x^2+5/4!*x^4+13/6!*x^6+41/8!*x^8...
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0
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1, 1, 5, 13, 41, 1529, -168851, 14151621, -1169749807, 65719458673, 5735813087573, -3489760303917315, 1000904582588332537, -229661980583327166359, 41111046331054702141117, -2494708337718975104154187, -2794803495926284988945714271
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sec[Tan[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Oct 15 2013 *)
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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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