Revert transform of 2*x*(1 - x - x^3 + x^6)-x/(1+x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =45a(5) =195a(6) =885a(7) =4151a(8) =19963a(9) =97899a(10) =487717a(11) =2461393a(12) =12557439a(13) =64657461a(14) =335562499a(15) =1753538133a(16) =9218852525a(17) =48725353661a(18) =258759350495