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A197093
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Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,4,0,0,1 for x=0,1,2,3,4
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1
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2, 18, 74, 384, 1880, 9274, 45843, 226260, 1117379, 5517062, 27241839, 134512788, 664185673, 3279563167, 16193558462, 79959241428, 394816250117, 1949491619113, 9626041441314, 47530685870146, 234693161662954, 1158848838643225
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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 4's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 0's, every 4 is next to 4 1's
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LINKS
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FORMULA
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Empirical: a(n) = 3*a(n-1) +5*a(n-2) +16*a(n-3) +26*a(n-4) +32*a(n-5) -2*a(n-6) +2*a(n-7) -30*a(n-8) +7*a(n-9) -3*a(n-10) +a(n-11) +a(n-12) -a(n-13)
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EXAMPLE
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Some solutions for n=4
..2..0..0....2..0..0....0..0..0....2..0..2....0..0..2....0..3..0....0..2..0
..0..0..2....0..0..0....0..0..3....0..0..0....2..3..0....2..0..0....0..2..2
..0..0..2....0..0..0....3..0..0....2..3..0....0..0..0....2..0..0....0..0..0
..0..3..0....0..0..2....0..0..0....0..0..0....0..3..0....0..0..2....0..3..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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