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

Terms

a(0) =1a(1) =2a(2) =6a(3) =17a(4) =48a(5) =136a(6) =385a(7) =1090a(8) =3086a(9) =8737a(10) =24736a(11) =70032a(12) =198273a(13) =561346a(14) =1589270a(15) =4499505a(16) =12738896a(17) =36066072a(18) =102109441a(19) =289089922a(20) =818464798a(21) =2317218881a(22) =6560457280a(23) =18573817120a(24) =52585767681a(25) =148879626882a(26) =421504606246