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 A024800 #11 Aug 28 2024 10:27:22 %S A024800 1,5,14,28,48,73,103,138,179,226,277,333,395,461,531,608,691,777,869, %T A024800 966,1068,1175,1287,1403,1526,1653,1783,1921,2063,2209,2362,2518,2682, %U A024800 2849,3022,3197,3378,3567,3759,3956,4160,4366,4578,4795,5018,5245,5476,5713 %N A024800 a(n) = position of 3*(n^2) in A000408. %Y A024800 Cf. A000408. %K A024800 nonn %O A024800 1,2 %A A024800 _Clark Kimberling_ %E A024800 Corrected and extended by _David W. Wilson_, May 15 1997