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A300918
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Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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1, 5, 20, 76, 290, 1245, 5160, 21819, 91713, 388059, 1639111, 6934811, 29326929, 124078694, 524899537, 2220794401, 9395650615, 39752075589, 168185729492, 711577787970, 3010611147958, 12737611709683, 53891601910235
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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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Empirical: a(n) = 2*a(n-1) +11*a(n-2) +a(n-3) -17*a(n-4) -46*a(n-5) -68*a(n-6) -42*a(n-7) +4*a(n-8) +43*a(n-9) +28*a(n-10) -34*a(n-11) -12*a(n-12) +8*a(n-13) +46*a(n-14) +22*a(n-15) +15*a(n-16) -2*a(n-17) -2*a(n-18) -3*a(n-19) -a(n-21) for n>22
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..1..1. .0..1..0. .0..0..0. .0..0..1. .0..0..0. .0..0..0
..0..0..0. .1..1..1. .1..1..1. .0..1..0. .0..1..1. .0..0..0. .0..0..1
..0..0..1. .0..1..0. .1..1..0. .0..0..0. .1..1..1. .1..1..0. .0..0..0
..0..0..0. .1..1..1. .0..0..0. .1..1..0. .0..1..1. .1..0..0. .1..0..0
..1..0..1. .1..1..1. .0..0..1. .1..0..0. .1..1..1. .0..0..0. .0..0..1
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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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