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A189181
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Number of nX4 array permutations with each element making a single king move
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1
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1, 185, 4081, 251720, 10599449, 524539713, 24377674329, 1162453545201, 54868164490816, 2600517767888745, 123049732810644217, 5826272557390770993, 275793998574143720745, 13056461887253840005544, 618083925262185774246993
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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) = 50*a(n-1) +189*a(n-2) -17418*a(n-3) +111208*a(n-4) +452547*a(n-5) -4449430*a(n-6) +190937*a(n-7) +29532742*a(n-8) -4370254*a(n-9) +186074662*a(n-10) -567421032*a(n-11) -487743654*a(n-12) -150818946*a(n-13) -265001610*a(n-14) +6374532886*a(n-15) -3311165152*a(n-16) -3325788742*a(n-17) +2609479826*a(n-18) -1073359914*a(n-19) +294380347*a(n-20) +4801462*a(n-21) -20168455*a(n-22) +4712116*a(n-23) -541926*a(n-24) -30393*a(n-25) +13302*a(n-26) -675*a(n-27)
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EXAMPLE
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Some solutions for 3X4
..1..2..3..6....5..0..3..2....5..0..1..2....4..0..3..2....1..6..3..2
..0..8..7.11....8..1..9..6....8.10..3.11....1..8..9.11....8..0.10.11
..9..4..5.10....4.10.11..7....9..4..6..7....5..6..7.10....9..4..5..7
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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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