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 A214524 #8 May 11 2015 18:07:32
%S A214524 16,61,1166,1616,1661,6116,6161,6611,111666,116166,116616,116661,
%T A214524 161166,161616,161661,166116,166161,166611,611166,611616,611661,
%U A214524 616116,616161,616611,661116,661161,661611,666111
%N A214524 List of words over {1,6} with equal numbers of 1's and 6's.
%C A214524 This is to 6 as A214522 is to 5, as A214521 is to 4, as A214488 is to 3, and as A214218 is to 2. The subsequence of primes (when interpreted as decimal integers) is A087513.
%H A214524 Harvey P. Dale, <a href="/A214524/b214524.txt">Table of n, a(n) for n = 1..1000</a>
%t A214524 Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{},2n,{1,6}]],{n,3}],1]] (* _Harvey P. Dale_, May 11 2015 *)
%Y A214524 Cf. A214218, A214488, A214521, A214522.
%K A214524 nonn,base,easy
%O A214524 1,1
%A A214524 _Jonathan Vos Post_, Jul 19 2012