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A235965
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Number of (n+1)X(1+1) 0..3 arrays colored with the upper median value of each 2X2 subblock
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1
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256, 1964, 13194, 85476, 556486, 3614066, 23457361, 152354048, 990262160, 6430004688, 41756569624, 271256431352, 1762097787460, 11443841761376, 74329271829200, 482816708790400, 3136044047363744, 20368663950465184
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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) = 96*a(n-3) +752*a(n-4) +1456*a(n-5) +6180*a(n-6) +6848*a(n-7) +13712*a(n-8) +9408*a(n-9) +12288*a(n-10) for n>13
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EXAMPLE
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Some solutions for n=4
..0..3....2..1....1..1....0..2....0..0....0..1....0..1....0..0....0..0....2..1
..0..2....3..0....2..3....1..3....1..2....1..2....0..0....3..0....1..2....0..0
..0..0....2..3....3..1....2..3....3..1....2..3....2..3....3..2....2..3....2..0
..2..1....0..1....2..0....1..1....0..1....3..2....3..2....1..1....0..3....1..1
..2..2....0..3....1..0....3..1....3..2....1..0....2..2....3..1....0..2....3..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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