Number of Gaussian integers z=a+bi satisfying n - 1/2 < |z| <= n + 1/2.

Terms

a(0) =1a(1) =8a(2) =12a(3) =16a(4) =32a(5) =28a(6) =40a(7) =40a(8) =48a(9) =68a(10) =56a(11) =72a(12) =68a(13) =88a(14) =88a(15) =84a(16) =112a(17) =112a(18) =112a(19) =116a(20) =112a(21) =144a(22) =140a(23) =144a(24) =144a(25) =168a(26) =164a(27) =160a(28) =184a(29) =172