Sizes of successive balls in E_8 lattice.

Terms

a(0) =1a(1) =241a(2) =2401a(3) =9121a(4) =26641a(5) =56881a(6) =117361a(7) =199921a(8) =340321a(9) =522001a(10) =794161a(11) =1113841a(12) =1604401a(13) =2131921a(14) =2874961a(15) =3721681a(16) =4845121a(17) =6024481a(18) =7659601a(19) =9306001a(20) =11513521a(21) =13825201a(22) =16702321a(23) =19622641a(24) =23553841a(25) =27334081