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a(n)=number of Gaussian integers z=a+bi satisfying |z|<=n+1/2, a>=0, 0<=b<=a.
0

%I #7 Mar 30 2012 18:56:27

%S 1,3,5,8,13,17,23,29,36,45,53,63,72,84,96,107,122,137,152,167,182,201,

%T 219,238,257,279,300,321,345,367,393,418,442,469,498,527,556,585,617,

%U 647,681,713,747,782,816,853,888,927,966,1006

%N a(n)=number of Gaussian integers z=a+bi satisfying |z|<=n+1/2, a>=0, 0<=b<=a.

%H <a href="/index/Ga#gaussians">Index entries for Gaussian integers and primes</a>

%K nonn

%O 0,2

%A _Clark Kimberling_