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 A355908 #12 Sep 19 2022 07:02:11 %S A355908 0,2,-2,4,-6,10,-14,22,-32,50,-74,112,-168,254,-380,572,-858,1288, %T A355908 -1932,2900 %N A355908 A335905(n) + A335906(n). %C A355908 This is also -2*A355907(n). %H A355908 Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/ambidextrous.pdf">Ambidextrous Numbers</a>, Preprint, September 2022. %Y A355908 Cf. A355904-A355907, A355909-A355913. %K A355908 sign,more %O A355908 0,2 %A A355908 _N. J. A. Sloane_, Sep 19 2022