Revert transform of 2*x*(1 - x - x^3 + x^4 - x^5)-x/(1+x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =43a(5) =183a(6) =815a(7) =3749a(8) =17693a(9) =85161a(10) =416451a(11) =2063255a(12) =10334187a(13) =52241811a(14) =266203487a(15) =1365869249a(16) =7050739841a(17) =36591914977a(18) =190811893315a(19) =999264296139