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 A256412 #7 Mar 02 2020 08:56:34 %S A256412 8,37,145,452,1374,3933 %N A256412 Column 2 of triangle in A256411. %Y A256412 Cf. A256411. %K A256412 nonn,more %O A256412 2,1 %A A256412 _N. J. A. Sloane_, Apr 03 2015