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A012162
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tan(tan(arcsinh(x)))=x+3/3!*x^3+41/5!*x^5+1187/7!*x^7+62129/9!*x^9...
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1
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1, 3, 41, 1187, 62129, 4782467, 547167193, 80119022947, 16118331113441, 3804780451118851, 1198259782941477641, 411098266056364045603, 189240360206280390564241, 87405020278156979563746947
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OFFSET
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0,2
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COMMENTS
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tan[Tan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 21 2014 *)
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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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STATUS
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approved
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