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A236259
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Number of (n+1)X(1+1) 0..3 arrays colored with the sets of distinct values in every 2X2 subblock, with new values 0..3 introduced row-major order
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1
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15, 132, 1571, 18995, 230395, 2794651, 33899863, 411212991, 4988112515, 60506987731, 733964167055, 8903159915783, 107997447907963, 1310034734765851, 15891032984074183, 192762010484105103, 2338249044226166771
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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) = 6*a(n-1) +60*a(n-2) +158*a(n-3) +205*a(n-4) -68*a(n-5) -408*a(n-6) -96*a(n-7) +144*a(n-8) for n>9
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EXAMPLE
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Some solutions for n=4
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0....0..1....0..1
..2..3....0..2....2..2....0..1....0..2....2..0....2..2....0..1....2..2....2..0
..0..2....1..3....2..0....2..2....2..2....1..3....1..1....2..2....3..2....1..3
..2..0....2..3....1..3....3..0....1..1....1..2....1..3....3..1....1..2....3..3
..3..3....0..3....2..2....1..3....0..1....3..0....0..2....1..3....1..1....1..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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