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 A355907 #13 Sep 19 2022 07:06:31 %S A355907 0,0,-1,1,-2,3,-5,7,-11,16,-25,37,-56,84,-127,190,-286,429,-644,966 %N A355907 A355906(n)/3. %C A355907 This is also -(A355905(n)+A355906(n))/2. %H A355907 Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/ambidextrous.pdf">Ambidextrous Numbers</a>, Preprint, September 2022. %Y A355907 Cf. A355904-A355906, A355908-A355913. %K A355907 sign,more %O A355907 0,5 %A A355907 _N. J. A. Sloane_, Sep 18 2022