E.g.f.: expansion of tanh(log(1+x))/exp(x).

Terms

a(0) =0a(1) =1a(2) =-3a(3) =6a(4) =-4a(5) =-45a(6) =339a(7) =-1442a(8) =2064a(9) =33309a(10) =-425935a(11) =2853246a(12) =-6127188a(13) =-142899809a(14) =2558171511a(15) =-23368092810a(16) =66908903744