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A210159
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Number of (n+1)X3 0..3 arrays with every 2X2 subblock having two or three distinct values, and new values 0..3 introduced in row major order
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1
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148, 6977, 351482, 17864271, 908980864, 46257884813, 2354098130302, 119802073302399, 6096832015875652, 310273110797149253, 15790069903296057458, 803570464268447301967, 40894403574255214909720
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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) = 55*a(n-1) -186*a(n-2) -1230*a(n-3) +2723*a(n-4) +159*a(n-5) -1604*a(n-6) +468*a(n-7)
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..1..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
..2..0..1....1..0..0....2..0..3....0..1..2....0..1..0....0..1..0....0..1..0
..0..2..0....1..0..2....3..0..1....2..1..1....2..2..1....0..1..1....1..2..1
..1..2..1....3..3..2....0..1..2....0..1..2....1..3..2....2..0..2....0..1..3
..3..1..0....1..0..3....1..1..0....2..2..1....0..1..1....0..1..0....1..3..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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