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 A004195 #10 Jun 11 2014 17:22:16 %S A004195 1,2,3,5,6,7,9,10,11,13,14,15,17,18,19,22,23,25,26,27,31,33,34,37,38, %T A004195 42,43,47,55,58,67,73,82,97,103 %N A004195 The numbers not expressible as the sum of 4 distinct nonzero squares can be written D*4^n union E. This is D. %H A004195 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a> %Y A004195 Cf. A004196, A004441. %K A004195 nonn,fini,full %O A004195 1,2 %A A004195 _N. J. A. Sloane_, _Dan Hoey_