Expansion of (1+2*x)/(1-6*x+x^2).

Terms

a(0) =1a(1) =8a(2) =47a(3) =274a(4) =1597a(5) =9308a(6) =54251a(7) =316198a(8) =1842937a(9) =10741424a(10) =62605607a(11) =364892218a(12) =2126747701a(13) =12395593988a(14) =72246816227a(15) =421085303374