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A012796 arctan(sec(x)*tan(x))=x+3/3!*x^3-15/5!*x^5-1197/7!*x^7-255/9!*x^9... 0
1, 3, -15, -1197, -255, 5448003, 241437105, -104019879597, -17849464279935, 5108933510880003, 2525823613297136625, -425245839735677809197, -661733086487793705145215, -4593026819719423131883197 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[ArcTan[Sec[x] Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 22 2017 *)
CROSSREFS
Sequence in context: A029521 A272353 A012766 * A231656 A096368 A016066
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified June 15 16:36 EDT 2024. Contains 373410 sequences. (Running on oeis4.)