This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A036704 #21 Oct 02 2014 02:52:49 %S A036704 1,9,21,37,69,97,137,177,225,293,349,421,489,577,665,749,861,973,1085, %T A036704 1201,1313,1457,1597,1741,1885,2053,2217,2377,2561,2733,2933,3125, %U A036704 3313,3521,3745,3969,4197,4421,4669,4905,5169,5417 %N A036704 a(n)=number of Gaussian integers z=a+bi satisfying |z|<=n+1/2. %H A036704 Robert Israel, <a href="/A036704/b036704.txt">Table of n, a(n) for n = 0..10000</a> %H A036704 Clive Tooth, <a href="/A036704/a036704.txt">A selection of a(n) values for n up to 10^9</a> %H A036704 <a href="/index/Ga#gaussians">Index entries for Gaussian integers and primes</a> %F A036704 a(n) = A057655(n^2+n). - _Robert Israel_, Sep 29 2014 %Y A036704 Cf. A057655. %K A036704 nonn %O A036704 0,2 %A A036704 _Clark Kimberling_