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

Terms

a(0) =1a(1) =3a(2) =4a(3) =12a(4) =13a(5) =39a(6) =40a(7) =120a(8) =121a(9) =363a(10) =364a(11) =1092a(12) =1093a(13) =3279a(14) =3280a(15) =9840a(16) =9841a(17) =29523a(18) =29524a(19) =88572a(20) =88573a(21) =265719a(22) =265720a(23) =797160a(24) =797161a(25) =2391483a(26) =2391484a(27) =7174452a(28) =7174453a(29) =21523359