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 A337268 #11 Jun 26 2025 12:20:51 %S A337268 2,5,16,52,174,618,2300,8764,34038,133858,530876,2112904,8417830, %T A337268 33592910,134211556,536403988,2144322638 %N A337268 a(n) = A335703(2n+1). %Y A337268 Cf. A328078, A335703, A337267, A337269. %K A337268 nonn,more %O A337268 0,1 %A A337268 _Rémy Sigrist_ and _N. J. A. Sloane_, Aug 26 2020