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 A213864 Number of words w where each letter of the n-ary alphabet occurs 4 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. 1
 1, 1, 19, 1075, 115955, 19558470, 4622269345, 1428739165560, 551211090935595, 256653852463806955, 140633739174235040170, 88931024447225475920050, 63897452586372538310261555, 51509615229665486538200354125, 46102293227619069563429377126200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE a(0) = 1: the empty word. a(1) = 1: aaaa. a(2) = 19: aaaabbbb, aaababbb, aaabbabb, aaabbbab, aabaabbb, aabababb, aababbab, aabbaabb, aabbabab, abaaabbb, abaababb, abaabbab, ababaabb, abababab, baaaabbb, baaababb, baaabbab, baabaabb, baababab. CROSSREFS Row n=4 of A213275. Sequence in context: A203582 A136021 A195214 * A217827 A098635 A217828 Adjacent sequences: A213861 A213862 A213863 * A213865 A213866 A213867 KEYWORD nonn AUTHOR Alois P. Heinz, Jun 23 2012 STATUS approved

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Last modified March 24 12:49 EDT 2023. Contains 361479 sequences. (Running on oeis4.)