Expansion of (1-x)^(-1)/(1-2*x-x^2-2*x^3).

Terms

a(0) =1a(1) =3a(2) =8a(3) =22a(4) =59a(5) =157a(6) =418a(7) =1112a(8) =2957a(9) =7863a(10) =20908a(11) =55594a(12) =147823a(13) =393057a(14) =1045126a(15) =2778956a(16) =7389153a(17) =19647515a(18) =52242096a(19) =138910014a(20) =369357155a(21) =982108517a(22) =2611394218a(23) =6943611264a(24) =18462833781a(25) =49092067263a(26) =130534190836a(27) =347086116498a(28) =922890558359