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A233219
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Number of 3Xn 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or antidiagonally, 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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1
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11, 452, 35446, 3054973, 268289572, 23644611625, 2085188355031, 183912477980908, 16221346021645357, 1430752109958104260, 126195026132569335016, 11130640168352123713243, 981743557172626207811542
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 111*a(n-1) -2128*a(n-2) +10532*a(n-3) -17559*a(n-4) +9045*a(n-5) for n>7
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EXAMPLE
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Some solutions for n=3
..0..1..0....0..1..0....0..1..5....0..1..1....0..1..2....0..1..2....0..1..2
..0..2..1....5..1..0....2..4..2....1..0..2....3..5..1....5..5..5....1..1..0
..4..0..4....2..2..0....0..0..0....2..1..1....1..1..0....3..3..5....1..1..3
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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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