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 A240611 #4 Apr 10 2014 12:26:33
%S A240611 1,1,2,5,14,46,164,629,2511,10284,42765,179411,757518,3212026,
%T A240611 13672821,58390509,250183486,1075280768,4636221163,20051763960,
%U A240611 86995226538,378588153837,1652550862097,7234850625649,31766225617819,139871594177849,617573798910950
%N A240611 Number of n-length words w over a 5-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.
%Y A240611 Column k=5 of A240608.
%K A240611 nonn
%O A240611 0,3
%A A240611 _Alois P. Heinz_, Apr 09 2014