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A233105
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Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order
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0
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1, 19, 24912, 794723482, 457873555330159, 4655818309443587944819, 835153023014356911992288011287, 2642740111638617064845250032401005032917, 147523503812676026261878057522783598121057848912309
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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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EXAMPLE
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Some solutions for n=3
..0..1..5....0..1..0....0..1..2....0..1..2....0..1..5....0..0..0....0..1..0
..4..2..4....1..5..4....4..3..1....2..1..2....2..1..1....0..1..1....4..2..2
..0..2..4....0..4..4....5..1..1....4..3..4....2..2..1....0..0..2....2..5..4
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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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