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A283722
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Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
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1
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0, 60, 1088, 15228, 196548, 2391696, 28103560, 322050940, 3622197748, 40156778920, 440103529194, 4778398401120, 51478875779886, 550962104490308, 5863716020439970, 62102879848049336, 654945091390069876
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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) = 14*a(n-1) -a(n-2) -226*a(n-3) -1460*a(n-4) -2232*a(n-5) +1525*a(n-6) +22350*a(n-7) +39289*a(n-8) +13206*a(n-9) -146613*a(n-10) -259034*a(n-11) -136682*a(n-12) +488660*a(n-13) +810954*a(n-14) +302750*a(n-15) -834146*a(n-16) -986264*a(n-17) -173928*a(n-18) +495516*a(n-19) +329204*a(n-20) +4440*a(n-21) -35121*a(n-22) -16332*a(n-23) -13884*a(n-24) -5504*a(n-25) -1072*a(n-26) -320*a(n-27) -64*a(n-28)
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EXAMPLE
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Some solutions for n=4
..1..1..0..0. .0..0..1..1. .0..0..0..1. .1..0..1..1. .0..0..1..1
..0..0..1..1. .1..1..0..1. .0..0..1..1. .1..0..1..0. .1..0..1..0
..0..0..0..1. .0..1..0..0. .0..0..0..1. .0..1..0..0. .0..1..1..0
..1..0..0..0. .0..0..1..0. .0..0..1..1. .1..0..0..1. .1..0..1..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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