Expansion of 1/(x^k*(1-x-3*x^(k+1))) for k=5.

Terms

a(0) =1a(1) =4a(2) =7a(3) =10a(4) =13a(5) =16a(6) =19a(7) =31a(8) =52a(9) =82a(10) =121a(11) =169a(12) =226a(13) =319a(14) =475a(15) =721a(16) =1084a(17) =1591a(18) =2269a(19) =3226a(20) =4651a(21) =6814a(22) =10066a(23) =14839a(24) =21646a(25) =31324a(26) =45277a(27) =65719a(28) =95917a(29) =140434