A trisection of 1/(1-x-x^4).

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =26a(5) =69a(6) =181a(7) =476a(8) =1252a(9) =3292a(10) =8657a(11) =22765a(12) =59864a(13) =157422a(14) =413966a(15) =1088589a(16) =2862617a(17) =7527704a(18) =19795288a(19) =52054840a(20) =136886433a(21) =359964521a(22) =946583628a(23) =2489191330a(24) =6545722210a(25) =17213011605a(26) =45264335853a(27) =119029728628