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 A355900 #5 Sep 03 2022 15:17:19 %S A355900 1,5,10,33,51,84,107,849 %N A355900 Indices of records in A355899. %Y A355900 Cf. A351871, A355898, A355899, A355901. %K A355900 nonn,more %O A355900 1,2 %A A355900 _N. J. A. Sloane_, Sep 03 2022