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A012428
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arctanh(arctan(x)*sin(x))=2/2!*x^2-12/4!*x^4+430/6!*x^6-27384/8!*x^8...
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0
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0, 2, -12, 430, -27384, 3086458, -524689220, 126513823462, -40981407368048, 17181884789561202, -9052122654113318396, 5854705311144202022046, -4561027328402726456335720, 4212695076131749316430016746
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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[ArcTanh[ArcTan[x]*Sin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)
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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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