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 A239300 #14 Jul 10 2015 18:03:31
%S A239300 1,1,4,27,255,3028,41979,647826,10807287,191374095,3554481788
%N A239300 Words of length n over the alphabet {0,...,n-1} that are 1324-avoiding.
%Y A239300 The permutation analog is A061552.
%Y A239300 Cf. A000312.
%K A239300 nonn,hard,more
%O A239300 0,3
%A A239300 _Chad Brewbaker_, Mar 14 2014
%E A239300 a(8)-a(10) from _Giovanni Resta_, Mar 14 2014