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 A323829 #9 Feb 08 2019 05:38:33 %S A323829 1,3,37,60,255 %N A323829 Position where n first appears in A306211, or -1 if n never appears. %C A323829 If 6 does appear in A306211, this happens after term 10228800161220 (see comments in A306211). %Y A323829 Cf. A306211. %K A323829 nonn,more,hard %O A323829 1,2 %A A323829 _N. J. A. Sloane_, Feb 01 2019