Expansion of 1/(x^k*(1-x-3*x^(k+1))) for k=7.

Terms

a(0) =1a(1) =4a(2) =7a(3) =10a(4) =13a(5) =16a(6) =19a(7) =22a(8) =25a(9) =37a(10) =58a(11) =88a(12) =127a(13) =175a(14) =232a(15) =298a(16) =373a(17) =484a(18) =658a(19) =922a(20) =1303a(21) =1828a(22) =2524a(23) =3418a(24) =4537a(25) =5989a(26) =7963a(27) =10729a(28) =14638a(29) =20122