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A205470
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Number of (n+1)X4 0..2 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..2 introduced in row major order
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1
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175, 1548, 14639, 147129, 1504556, 15614579, 162976758, 1709130780, 17963198743, 189127385194, 1993106187666, 21019022873891, 221754001074914, 2340228495931166, 24701472352877203, 260760556151955406
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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) = 20*a(n-1) -75*a(n-2) -688*a(n-3) +5022*a(n-4) -496*a(n-5) -63723*a(n-6) +111258*a(n-7) +251463*a(n-8) -817674*a(n-9) -9180*a(n-10) +2101200*a(n-11) -1759426*a(n-12) -1578136*a(n-13) +2839836*a(n-14) -596208*a(n-15) -1049272*a(n-16) +620728*a(n-17) +18624*a(n-18) -96072*a(n-19) +24528*a(n-20) -1728*a(n-21)
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EXAMPLE
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Some solutions for n=4
..0..0..1..1....0..1..1..0....0..1..0..2....0..0..0..0....0..0..1..2
..2..0..1..0....1..1..0..0....1..1..0..0....1..1..0..2....1..2..1..0
..0..0..0..0....2..1..0..1....2..1..1..1....1..0..0..2....0..0..1..2
..2..2..0..1....1..1..0..0....1..1..2..1....0..0..2..2....1..2..1..0
..2..0..0..0....1..0..0..1....1..2..2..1....0..2..2..0....0..0..1..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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