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 A051197 #4 Mar 30 2012 18:57:01 %S A051197 0,6,24,120,480,2002,7952,31824,125760,497420,1960464,7726160, %T A051197 30418752,119759850,471424160,1855967520,7307828352,28781143380, %U A051197 113380093840,446775310800,1761038703424,6943526580276,27385654785504 %N A051197 T(2n+4,n), array T as in A050186; a count of aperiodic binary words. %K A051197 nonn %O A051197 0,2 %A A051197 _Clark Kimberling_