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A263780
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Number of inversion sequences avoiding pattern 100.
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28
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1, 1, 2, 6, 23, 106, 565, 3399, 22678, 165646, 1311334, 11161529, 101478038, 980157177, 10011461983, 107712637346, 1216525155129, 14380174353934, 177440071258827, 2280166654498540, 30450785320307436, 421820687108853017, 6050801956624661417, 89738550379292147192
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OFFSET
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0,3
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COMMENTS
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Number of length n inversion sequences avoiding e_i > e_j = e_k for i<j<k. A length n inversion sequence e_1,e_2,...,e_n consists of nonnegative integers e_t <= t-1. - Alois P. Heinz, Dec 19 2016
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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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EXTENSIONS
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STATUS
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approved
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