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A213867
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Number of words w where each letter of the n-ary alphabet occurs 7 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.
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1
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1, 1, 561, 2914395, 54862627919, 2468722942369153, 211109968702038259993, 29745278219128813035415595, 6273648300104128965616586081511, 1850042480471503379038420801262526759, 725168149513389307543056971716033431701831
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OFFSET
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0,3
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LINKS
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EXAMPLE
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a(0) = 1: the empty word.
a(1) = 1: aaaaaaa.
a(2) = 561: aaaaaaabbbbbbb, aaaaaababbbbbb, ..., baababababaabb, baabababababab.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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