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 A213292 #5 Jun 15 2012 03:52:11 %S A213292 1,4,16,46,118,276,712,1805,4895,13280,37993,109386,328219,992413, %T A213292 3101399,9764376,31580645,102797899,342075208,1144125506,3896297053, %U A213292 13319243655,46206520968,160729837020,565901313043,1996113320841,7111795754941,25369213794266 %N A213292 Number of n-length words w over 4-ary alphabet such that 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. %H A213292 Alois P. Heinz, <a href="/A213292/b213292.txt">Table of n, a(n) for n = 0..130</a> %Y A213292 Column k=4 of A213276. %K A213292 nonn %O A213292 0,2 %A A213292 _Alois P. Heinz_, Jun 08 2012