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A227255
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Number of n X 5 binary arrays indicating whether each 2 X 2 subblock of a larger binary array has lexicographically nondecreasing rows and columns, for some larger (n+1) X 6 binary array with rows and columns of the latter in lexicographically nondecreasing order.
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1
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11, 53, 450, 4578, 44379, 385212, 2925969, 19641271, 118614860, 654214381, 3334753195, 15858202072, 70892618881, 299805425605, 1205758757487, 4632388331446, 17066069541973, 60489294799563, 206864212649513
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical polynomial of degree 47 (see link above).
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EXAMPLE
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Some solutions for n=4
..1..1..1..0..0....1..1..1..0..1....1..1..0..0..0....1..1..1..1..1
..1..1..0..1..1....1..0..0..1..1....1..0..1..1..1....1..1..1..0..0
..1..1..1..1..1....0..1..1..0..1....1..1..1..1..1....1..1..0..0..0
..1..0..0..1..1....1..1..0..1..0....1..0..1..1..0....1..0..0..0..0
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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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