Expansion of e.g.f.: tanh(log(1+x))/cosh(x).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-3a(4) =12a(5) =-5a(6) =-75a(7) =203a(8) =-1232a(9) =16245a(10) =-44685a(11) =-957671a(12) =11106876a(13) =-34555105a(14) =-281002631a(15) =4852910775a(16) =-67849574400a(17) =823102605865