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 A051199 #4 Mar 30 2012 18:57:01 %S A051199 0,8,40,216,980,4368,18468,77520,319440,1307448,5310448,21474180, %T A051199 86488020,347373600,1391956192,5567901768,22239898848,88732378800, %U A051199 353696824152,1408831480056,5608231863080,22314239255088 %N A051199 T(2n+6,n), array T as in A050186; a count of aperiodic binary words. %K A051199 nonn %O A051199 0,2 %A A051199 _Clark Kimberling_