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 A083056 #7 Jun 26 2022 05:22:47 %S A083056 2,1,0,-1,-2,0,-1,1,0,-1,1,0,2,1,3,2,1,3,2,4,3,2,1,0,2,1,3,2,1,0,-1,1, %T A083056 0,2,1,0,2,1,3,2,1,0,-1,1,0,2,1,0,-1,-2,0,-1,1,0,-1,-2,-3,-1,-2,0,-1, %U A083056 -2,0,-1,1,0,-1,-2,-3,-1,-2,0,-1,-2,-3,-4,-2,-3,-1,-2,-3,-1,-2,0,-1,1,0,-1,1,0,2,1,0,-1,-2,0,-1,1,0,-1,-2,-3,-1,-2,0 %N A083056 a(n) = 3*A083055(n)-n. %H A083056 Boris Gourevitch, <a href="http://membres.lycos.fr/bgourevitch/temporaires/benoit/sqrt3fractal.jpg">Graph of A083057</a> %Y A083056 Cf. A083038, A083054, A083055, A083057. %K A083056 sign %O A083056 1,1 %A A083056 _Benoit Cloitre_, Apr 18 2003