Expansion of e.g.f. exp(arctanh(x)/exp(x)).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =0a(4) =9a(5) =-20a(6) =65a(7) =406a(8) =-511a(9) =21624a(10) =88577a(11) =1053426a(12) =14764321a(13) =143838916a(14) =2193647521a(15) =29669704702a(16) =457719400449