Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=4.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =11a(6) =17a(7) =27a(8) =41a(9) =59a(10) =81a(11) =115a(12) =169a(13) =251a(14) =369a(15) =531a(16) =761a(17) =1099a(18) =1601a(19) =2339a(20) =3401a(21) =4923a(22) =7121a(23) =10323a(24) =15001a(25) =21803a(26) =31649a(27) =45891a(28) =66537a(29) =96539