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A013391
-arctan(sin(x)-arctanh(x))=3/3!*x^3+23/5!*x^5+721/7!*x^7+25199/9!*x^9...
0
0, 3, 23, 721, 25199, 1716121, 141920855, 20103619537, 4016386229855, 1241116799607721, 494609567396520071, 244232906612554953633, 140315440295583485315151, 92810530303082004433849401
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[-ArcTan[Sin[x]-ArcTanh[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 29 2016 *)
CROSSREFS
Sequence in context: A143985 A333739 A119669 * A013389 A013393 A013390
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved