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A012078
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arctan(arcsin(tan(x)))=x+1/3!*x^3+9/5!*x^5+393/7!*x^7+33009/9!*x^9...
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0
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1, 1, 9, 393, 33009, 4410033, 872617017, 240500373753, 88094910348129, 41401437242599905, 24287046275803547625, 17396048031084882189033, 14941352753081733849348945, 15157924050230673397966293393
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..13.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcSin[Tan[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 07 2021 *)
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CROSSREFS
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Sequence in context: A297738 A225988 A012191 * A332139 A266924 A157599
Adjacent sequences: A012075 A012076 A012077 * A012079 A012080 A012081
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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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STATUS
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approved
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