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 A248408 #6 Oct 28 2014 00:27:06 %S A248408 2,1,3,5,2,4,6,9,10,1,12,10,7,7,13,13,14,2,15,16,8,13,16,5,7,19,7,11, %T A248408 2,6,4,13,6,8,22,21,10,21,24,10,17,20,25,3,7,22,19,16,26,21,11,18,28, %U A248408 18,23,26,30,10,29,31,31,28,32,24,1,24,5,21,5,7,26,18,29,11,33,20,32,35,15,28,2,22 %N A248408 Values of y in A142508(n) = x^2+13y^2. %e A248408 a(1)=2 because A142508(1)=53=1^2+13*2^2 (x=1,y=2); %e A248408 a(2)=1 because A142508(2)=157=12^2+13*1^2 (x=12, y=1). %Y A248408 Cf. A033210, A142508, A248221, A248019(values of x). %K A248408 nonn %O A248408 1,1 %A A248408 _Zak Seidov_, Oct 06 2014