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

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =37a(5) =98a(6) =261a(7) =694a(8) =1845a(9) =4906a(10) =13045a(11) =34686a(12) =92229a(13) =245234a(14) =652069a(15) =1733830a(16) =4610197a(17) =12258362a(18) =32594581a(19) =86667918a(20) =230447141a(21) =612751362a(22) =1629285701a(23) =4332217046a(24) =11519222517a(25) =30629233482a(26) =81442123573a(27) =216551925662a(28) =575804441861