Expansion of g.f.: (1+4*x)/(1-x)^7.

Terms

a(0) =1a(1) =11a(2) =56a(3) =196a(4) =546a(5) =1302a(6) =2772a(7) =5412a(8) =9867a(9) =17017a(10) =28028a(11) =44408a(12) =68068a(13) =101388a(14) =147288a(15) =209304a(16) =291669a(17) =399399a(18) =538384a(19) =715484a(20) =938630a(21) =1216930a(22) =1560780a(23) =1981980a(24) =2493855a(25) =3111381a(26) =3851316a(27) =4732336a(28) =5775176a(29) =7002776