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Number of sets of nonempty words with a total of n letters over senary alphabet containing the sixth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
2

%I #4 Oct 18 2017 19:12:05

%S 1,7,49,268,1448,7228,35878,172470,828380,3924415,18627313,87940196,

%T 416581962,1971018227,9364427840,44535275966,212749669917,

%U 1018545160923,4898593478484,23625691956720,114460931725922,556278543737430,2715406810871312,13298453769286699

%N Number of sets of nonempty words with a total of n letters over senary alphabet containing the sixth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.

%H Alois P. Heinz, <a href="/A293887/b293887.txt">Table of n, a(n) for n = 6..1000</a>

%F a(n) = A293745(n) - A293744(n).

%Y Column k=6 of A293113.

%Y Cf. A293744, A293745.

%K nonn

%O 6,2

%A _Alois P. Heinz_, Oct 18 2017