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 A024802 #9 Aug 28 2024 10:27:14 %S A024802 6,15,30,50,75,104,140,181,228,279,335,396,463,533,610,693,779,870, %T A024802 968,1070,1177,1289,1405,1528,1655,1785,1923,2064,2211,2364,2520,2684, %U A024802 2851,3023,3199,3380,3569,3761,3958,4162,4368,4580,4797,5019,5247,5478,5715 %N A024802 a(n) = position of n^2 + (n+1)^2 + (n+2)^2 in A000408. %K A024802 nonn %O A024802 1,1 %A A024802 _Clark Kimberling_ %E A024802 Corrected and extended by _David W. Wilson_, May 15 1997