A036703 a(n)=number of Gaussian integers z=a+bi satisfying n-1<|z|<=n, a>=0, 0<=b<=a.

1, 1, 2, 3, 3, 5, 5, 5, 7, 8, 9, 8, 9, 12, 11, 13, 12, 14, 14, 16, 17, 15, 19, 18, 18, 22, 21, 22, 21, 23, 25, 23, 27, 26, 28, 29, 26, 31, 28, 34, 32, 30, 34, 34, 37, 36, 34, 38, 37, 40, 41, 42, 41, 40, 43, 42, 47, 44, 47, 45, 48