Expansion of (1-x^7)/(1-x)^7.

Terms

a(0) =1a(1) =7a(2) =28a(3) =84a(4) =210a(5) =462a(6) =924a(7) =1715a(8) =2996a(9) =4977a(10) =7924a(11) =12166a(12) =18102a(13) =26208a(14) =37044a(15) =51261a(16) =69608a(17) =92939a(18) =122220a(19) =158536a(20) =203098a(21) =257250a(22) =322476a(23) =400407a(24) =492828a(25) =601685a(26) =729092a(27) =877338a(28) =1048894a(29) =1246420