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 A024809 #9 Aug 28 2024 10:27:04 %S A024809 1,4,13,26,44,69,98,137,179,227,278,338,402,470,541,622,707,796,891, %T A024809 991,1097,1206,1320,1443,1569,1697,1834,1974,2120,2269,2423,2585,2752, %U A024809 2923,3099,3280,3467,3658,3853,4056,4261,4473,4689,4911,5136,5366,5602,5844 %N A024809 a(n) = position of n^2 + (n+1)^2 + (n+2)^2 in A004432. %K A024809 nonn %O A024809 1,2 %A A024809 _Clark Kimberling_ %E A024809 Corrected and extended by _David W. Wilson_, May 15 1997