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A252981
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Number of nX6 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down
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2
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10, 85, 851, 8487, 67537, 432842, 5672484, 36112108, 129234988, 322183180, 635379492, 1074743076, 1640984356, 2334103332, 3154100004, 4100974372, 5174726436, 6375356196, 7702863652, 9157248804, 10738511652, 12446652196
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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: a(n) = 63438848*n^2 - 1019729920*n + 4176308004 for n>10
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EXAMPLE
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Some solutions for n=4
..0..1..1..1..1..2....0..1..1..1..2..2....0..1..2..2..2..2....0..0..1..1..1..1
..0..1..1..1..2..2....0..1..1..2..2..2....1..1..2..2..2..3....1..1..1..2..2..2
..0..1..1..1..2..3....1..1..1..2..2..2....1..1..2..2..2..3....1..2..2..2..2..3
..1..1..2..2..2..3....1..1..1..2..2..3....1..2..2..2..2..3....2..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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