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 A294447 #9 Nov 22 2017 21:01:22 %S A294447 2,4,6,18,54 %N A294447 Lengths of square subwords (WW) of Kolakoski sequence A000002. %C A294447 Carpi also shows that the Kolakoski sequence contains no cubes. %H A294447 Arturo Carpi, <a href="https://doi.org/10.1016/0020-0190(94)00162-6">On repeated factors in C∞-words</a>, Information Processing Letters 52 (1994), 289-294. %Y A294447 Cf. A000002. %K A294447 nonn,fini,full %O A294447 1,1 %A A294447 _N. J. A. Sloane_, Nov 21 2017