Expansion of g.f. -(1+x^2+x^4)/((x^3+x^2+x-1)*(x-1)^2).

Terms

a(0) =1a(1) =3a(2) =8a(3) =18a(4) =38a(5) =76a(6) =147a(7) =279a(8) =523a(9) =973a(10) =1802a(11) =3328a(12) =6136a(13) =11302a(14) =20805a(15) =38285a(16) =70437a(17) =129575a(18) =238348a(19) =438414a(20) =806394a(21) =1483216a(22) =2728087a(23) =5017763a(24) =9229135a(25) =16975057a(26) =31222030a(27) =57426300a(28) =105623468a(29) =194271882