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A213292
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Number of n-length words w over 4-ary alphabet such that 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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2
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1, 4, 16, 46, 118, 276, 712, 1805, 4895, 13280, 37993, 109386, 328219, 992413, 3101399, 9764376, 31580645, 102797899, 342075208, 1144125506, 3896297053, 13319243655, 46206520968, 160729837020, 565901313043, 1996113320841, 7111795754941, 25369213794266
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OFFSET
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0,2
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LINKS
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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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