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A024295
Expansion of log(1+tanh(x)*x)/2.
0
0, 1, -10, 288, -16656, 1629440, -242569728, 51150403584, -14514466195456, 5334038568566784, -2464645606175539200, 1398530065161670098944, -956068708752272063987712, 775009022325905883458961408, -735038625130292891682693185536
OFFSET
0,3
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Log[1+Tanh[x]*x]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 04 2013 *)
CROSSREFS
Cf. A009399.
Sequence in context: A360341 A049387 A222672 * A291658 A159960 A258794
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
STATUS
approved