Expansion of log(1+tanh(x)*x)/2.A024295Expansion of log(1+tanh(x)*x)/2.Terms a(0) =0a(1) =1a(2) =-10a(3) =288a(4) =-16656a(5) =1629440a(6) =-242569728a(7) =51150403584External referencesoeis: A024295