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A226990
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Number of nX4 0..4 arrays of sums of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order
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1
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21, 313, 2820, 24158, 180712, 1187869, 6897735, 35818171, 168412446, 725322952, 2890248513, 10747422169, 37565694126, 124186120157, 390330632256, 1171738349385, 3372578086357, 9339039810942, 24954235842112, 64510189847669
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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 31 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..0..2..4....0..0..1..3....0..0..1..3....1..2..2..3....0..1..2..2
..0..0..2..4....0..1..2..3....1..2..3..3....2..1..1..2....0..2..4..3
..0..1..2..2....1..3..2..2....2..4..4..2....3..2..2..2....1..2..3..3
..0..2..2..1....2..3..3..2....3..4..4..3....4..4..3..2....2..3..3..3
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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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