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A197166
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Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,2,1,4,0 for x=0,1,2,3,4
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1
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9, 803, 34021, 1566649, 76504483, 3683084153, 178698032203, 8671417152697, 420572258618870, 20392149427584727, 988923590004910009, 47963802827535239077, 2326158501038746896505, 112811333889530786883021
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OFFSET
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1,1
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COMMENTS
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Every 0 is next to 0 3's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 4's, every 4 is next to 4 0's
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..0..1..2..0..0....0..0..0..1..0..0..0....0..0..0..0..1..2..1
..0..0..0..0..1..1..2....0..0..1..2..0..1..0....0..0..0..0..1..2..0
..1..0..2..1..1..0..1....0..4..0..0..1..2..0....1..0..2..1..0..1..0
..2..1..1..1..2..0..0....0..0..1..2..1..0..0....2..1..1..1..2..1..0
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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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