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A024333
Expansion of e.g.f: tanh(log(1+x)^2)/2.
0
0, 0, 1, -3, 11, -50, 154, 756, -25572, 434736, -6324264, 84312360, -1014504360, 9750096720, -26179417200, -2263442045760, 92224441646400, -2623899775526400, 64132749053646720, -1393649719639125120, 25953090802663939200, -339671851067737440000
OFFSET
0,4
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Tanh[Log[1+x]^2]/2, {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 22 2019 *)
CROSSREFS
Cf. A009789.
Sequence in context: A265905 A058733 A203163 * A024334 A162477 A115081
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs, Mar 1997
Definition clarified and prior Mathematica program replaced by ~~~
STATUS
approved