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 A239370 #5 Mar 19 2014 13:10:23
%S A239370 1,1,4,27,250,2915,40806,664944
%N A239370 Words of length n over the alphabet {0,...,n-1} that avoid the pattern 1122.
%Y A239370 Cf. A239295.
%K A239370 nonn,more
%O A239370 0,3
%A A239370 _Chad Brewbaker_, Mar 17 2014