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A347677
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Number of Baxter matrices of size 3 X n that contain n+2 1's.
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2
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1, 8, 26, 55, 96, 149, 214, 291, 380, 481, 594, 719, 856, 1005, 1166, 1339, 1524, 1721, 1930, 2151, 2384, 2629, 2886, 3155, 3436, 3729, 4034, 4351, 4680, 5021, 5374, 5739, 6116, 6505, 6906, 7319, 7744, 8181, 8630, 9091, 9564, 10049, 10546, 11055, 11576, 12109
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 6*n^2 - 13*n + 11 for n >= 3. - George Spahn, Oct 20 2021
g.f.: x+8*x^2 -x^3 *(26-23*x+9*x^2)/(x-1)^3 . - R. J. Mathar, Aug 20 2022
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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