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A012685
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cosh(tanh(x)*arctan(x))=1+12/4!*x^4-480/6!*x^6+28560/8!*x^8...
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0
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1, 0, 12, -480, 28560, -2595840, 342910656, -62365675008, 14932846506240, -4548435497041920, 1716639310480919552, -786314410657025941504, 429828791337549223596032, -276479195899367035140833280
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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[Cosh[Tanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 20 2024 *)
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CROSSREFS
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KEYWORD
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sign,changed
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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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