Expansion of 2*(1+2*x) / (1-8*x+4*x^2).

Terms

a(0) =2a(1) =20a(2) =152a(3) =1136a(4) =8480a(5) =63296a(6) =472448a(7) =3526400a(8) =26321408a(9) =196465664a(10) =1466439680a(11) =10945654784a(12) =81699479552a(13) =609813217280