Sizes of successive balls in D_4 lattice.

Terms

a(0) =1a(1) =25a(2) =49a(3) =145a(4) =169a(5) =313a(6) =409a(7) =601a(8) =625a(9) =937a(10) =1081a(11) =1369a(12) =1465a(13) =1801a(14) =1993a(15) =2569a(16) =2593a(17) =3025a(18) =3337a(19) =3817a(20) =3961a(21) =4729a(22) =5017a(23) =5593a(24) =5689a(25) =6433a(26) =6769a(27) =7729a(28) =7921a(29) =8641