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 A024513 #4 Mar 30 2012 18:55:55 %S A024513 1,3,6,12,18,25,34,42,55,66,80,94,110,127,144,162,183,204,224,248,272, %T A024513 296,322,348,378,407,434,469,500,533,565,601,636,674,712,752,792,832, %U A024513 873,918,960,1007,1051,1094,1144,1191,1240,1290,1342,1395,1448,1504 %N A024513 a(n) = position of n^2 + (n+1)^2 in A004431 (sums of 2 distinct nonzero squares). %K A024513 nonn %O A024513 1,2 %A A024513 _Clark Kimberling_ %E A024513 More terms from _Ralf Stephan_, Mar 26 2003