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 A057656 #3 Mar 30 2012 16:48:53 %S A057656 2,6,8,12,16,16,22,26,26,30,34,38,40,44,44,48,56,56,60,60,62,70,74,74, %T A057656 78,82,82,86,90,94,96,104,104,104,108,108,116,120,124,128,128,128,134, %U A057656 138,138,142,150,150,154,158,158,166,166,166,166,174 %N A057656 Number of points (x,y) in square lattice with (x-1/2)^2+y^2 <= n. %D A057656 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 106. %Y A057656 Partial sums of A004020. Cf. A057656, A057961, A057962. %K A057656 nonn %O A057656 0,1 %A A057656 _N. J. A. Sloane_, Oct 15 2000