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A012968
arctanh(arctan(x)+log(x+1))=2*x-1/2!*x^2+16/3!*x^3-54/4!*x^4+876/5!*x^5...
0
0, 2, -1, 16, -54, 876, -6630, 122904, -1558536, 33455520, -601095600, 14941817856, -346714064928, 9916498091808, -280431880000272, 9142107223322304, -303483440198252160, 11161636493381966592
OFFSET
0,2
MATHEMATICA
With[{nn=30}, CoefficientList[Series[ArcTanh[ArcTan[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Ray Chandler, Nov 28 2016 *)
CROSSREFS
Sequence in context: A013121 A012963 A013120 * A266827 A316226 A352138
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved