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

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

%S 0,2,5,9,17,24,34,44,56,73,87,105,122,144,166,187,215,243,271,300,328,

%T 364,399,435,471,513,554,594,640,683,733,781,828,880,936,992,1049,

%U 1105,1167,1226,1292,1354,1420,1489,1555,1627,1696

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

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

%K nonn

%O 0,2

%A _Clark Kimberling_