A024295 Expansion of log(1+tanh(x)*x)/2.

0, 1, -10, 288, -16656, 1629440, -242569728, 51150403584, -14514466195456, 5334038568566784, -2464645606175539200, 1398530065161670098944, -956068708752272063987712, 775009022325905883458961408, -735038625130292891682693185536

Offset

0,3

Links

Table of n, a(n) for n=0..14.

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

Adjacent sequences: A024292 A024293 A024294 * A024296 A024297 A024298

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs Mar 1997

Status

approved