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A232291
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Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally
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1
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15, 587, 20563, 718483, 25116353, 877968487, 30690409685, 1072818688305, 37501616113029, 1310912294899905, 45824453004106979, 1601846669127816785, 55994400002283842181, 1957348909882095004225, 68421391333068584221039
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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) = 30*a(n-1) +171*a(n-2) +93*a(n-3) -496*a(n-4) -281*a(n-5) +186*a(n-6) +206*a(n-7) -173*a(n-8) +45*a(n-9) -4*a(n-10)
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EXAMPLE
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Some solutions for n=3
..2..2..2..2....2..0..1..2....1..2..2..0....1..2..2..0....2..1..0..2
..2..2..2..2....2..1..2..2....2..2..1..2....0..1..1..2....0..2..2..1
..0..1..1..0....0..1..2..1....1..2..1..0....2..1..1..0....1..1..0..2
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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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