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A012812
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sec(sec(x)*arctan(x))=1+1/2!*x^2+9/4!*x^4+345/6!*x^6+14833/8!*x^8...
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0
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1, 1, 9, 345, 14833, 1493265, 158895033, 30935964969, 6150088646497, 1967749424641953, 629235472952720105, 300014790466799113849, 140704010339485622390865, 93651237671421167849769905
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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[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 06 2022 *)
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CROSSREFS
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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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