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%I #4 Nov 19 2018 18:03:21
%S 24,60,210,609,1961,5952,19255,60812,200281,652011,2185981,7283988,
%T 24809651,84207955,290756694,1001820292,3500030779,12211804429,
%U 43101225586,151996648798,541273095677,1926487411495,6914504463171,24808989286716,89666142346093
%N Number of words w of length n such that each letter of the quaternary alphabet is used at least once 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.
%H Alois P. Heinz, <a href="/A321840/b321840.txt">Table of n, a(n) for n = 4..150</a>
%Y Column k=4 of A257783.
%K nonn
%O 4,1
%A _Alois P. Heinz_, Nov 19 2018
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