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 A337267 #8 Aug 27 2020 01:54:40 %S A337267 1,3,9,30,95,326,1195,4478,17251,67326,266331,1058146,4216075, %T A337267 16808282,67130923,268281390,1072424939 %N A337267 A335703(2n). %Y A337267 Cf. A328078, A335703, A337268, A337269. %K A337267 nonn,more %O A337267 0,2 %A A337267 _Rémy Sigrist_ and _N. J. A. Sloane_, Aug 26 2020