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A012231 exp(arctan(arctanh(x)))=1+x+1/2!*x^2+1/3!*x^3+1/4!*x^4+9/5!*x^5... 1
1, 1, 1, 1, 1, 9, 49, 281, 1345, 13233, 105441, 1179729, 10336833, 144386553, 1580651409, 25501409961, 316289380737, 5869292202465, 83559601907649, 1744083324947745, 27709107620492673, 643531258862953065 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,6
LINKS
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Exp[ArcTan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Ray Chandler, Nov 28 2016 *)
CROSSREFS
Sequence in context: A146798 A055428 A359186 * A123270 A114040 A231178
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified April 12 19:05 EDT 2024. Contains 371636 sequences. (Running on oeis4.)