cp's OEIS Frontend

A213876 Number of words w where each letter of the 6-ary alphabet occurs n 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.

%I A213876 #4 Jun 24 2012 12:58:43
%S A213876 1,720,10395,3864040,4622269345,10915151070941,40684710729862072,
%T A213876 211109968702038259993,1409438188685787895321841,
%U A213876 11481253272835564584899247346,109898940874611419792791074271620,1202306852636261419990922606451803760
%N A213876 Number of words w where each letter of the 6-ary alphabet occurs n 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 A213876 a(0) = 1: the empty word.
%e A213876 a(1) = 720: abcdef, abcdfe, abcedf, ..., fedbca, fedcab, fedcba.
%e A213876 a(2) = 10395: aabbccddeeff, aabbccddefef, aabbccddfeef, ..., fedcaabbcdef, fedcababcdef, fedcbaabcdef.
%Y A213876 Column k=6 of A213275.
%K A213876 nonn
%O A213876 0,2
%A A213876 _Alois P. Heinz_, Jun 23 2012