Number of points of norm <= n^2 in square lattice.

Terms

a(0) =1a(1) =5a(2) =13a(3) =29a(4) =49a(5) =81a(6) =113a(7) =149a(8) =197a(9) =253a(10) =317a(11) =377a(12) =441a(13) =529a(14) =613a(15) =709a(16) =797a(17) =901a(18) =1009a(19) =1129a(20) =1257a(21) =1373a(22) =1517a(23) =1653a(24) =1793a(25) =1961a(26) =2121a(27) =2289a(28) =2453a(29) =2629