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 A320483 #4 Oct 22 2018 21:09:26 %S A320483 1,12,30,110,382,1270,4298,14560,49204 %N A320483 Row 4 of array in A320500. %Y A320483 Cf. A320500. %K A320483 nonn,more %O A320483 1,2 %A A320483 _N. J. A. Sloane_, Oct 22 2018, based on email from _Don Knuth_, Oct 20 2018