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A189275
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Number of nX4 array permutations with each element not moved or moved diagonally or antidiagonally by one
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2
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1, 25, 225, 2704, 29241, 323761, 3553225, 39100009, 429981696, 4729725529, 52022767225, 572215089601, 6293931930441, 69228590218384, 761462776998225, 8375523274873225, 92124512415080401, 1013300979290647441
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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) = 12*a(n-1) -7*a(n-2) -78*a(n-3) +365*a(n-4) +67*a(n-5) +269*a(n-6) -269*a(n-7) -67*a(n-8) -365*a(n-9) +78*a(n-10) +7*a(n-11) -12*a(n-12) +a(n-13)
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EXAMPLE
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Some solutions for 3X4
..0..4..2..3....0..6..5..3....0..6..7..3....0..6..7..3....0..6..2..3
..1.10.11..7....4.10..1..2....9.10..1..2....9..8..1..2....1.10..9..7
..8..9..5..6....8..9..7.11....8..4..5.11....5..4.10.11....8..4..5.11
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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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