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 A213866 #4 Jun 24 2012 12:57:50 %S A213866 1,1,174,188196,586368681,3745777177366,40684710729862072, %T A213866 668821362774214965294,15388200323143520006870562, %U A213866 468682891926540940991787213006,18131599140232990157442722880124741,863168115684925396146477660939182979547 %N A213866 Number of words w where each letter of the n-ary alphabet occurs 6 times and for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z. %e A213866 a(0) = 1: the empty word. %e A213866 a(1) = 1: aaaaaa. %e A213866 a(2) = 174: aaaaaabbbbbb, aaaaababbbbb, ..., baabababaabb, baababababab. %Y A213866 Row n=6 of A213275. %K A213866 nonn %O A213866 0,3 %A A213866 _Alois P. Heinz_, Jun 23 2012