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

Terms

a(0) =1a(1) =2a(2) =0a(3) =-4a(4) =16a(5) =-48a(6) =64a(7) =800a(8) =-12288a(9) =127232a(10) =-1150976a(11) =9266688a(12) =-58726400a(13) =68777984a(14) =7510646784a(15) =-207794409472