Expansion of e.g.f. log(1 + 2*x/(exp(x) + 1)).

Terms

a(0) =0a(1) =1a(2) =-2a(3) =5a(4) =-20a(5) =109a(6) =-738a(7) =5991a(8) =-56760a(9) =614601a(10) =-7486670a(11) =101330635a(12) =-1508641140a(13) =24503026989a(14) =-431137315434