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A210129
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Number of (n+1)X4 0..3 arrays with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in row major order
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1
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897, 84381, 7873809, 735336694, 68668190865, 6412512897051, 598825892889354, 55920742053335527, 5222101117981021055, 487660555133397778704, 45539680606576639531819, 4252676350267258941002997
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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) = 95*a(n-1) -a(n-2) -14266*a(n-3) +20367*a(n-4) +435937*a(n-5) -1093869*a(n-6) -1923590*a(n-7) +8479272*a(n-8) -8472184*a(n-9) +1936944*a(n-10) +631296*a(n-11)
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EXAMPLE
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Some solutions for n=4
..0..1..0..2....0..0..0..1....0..1..1..0....0..0..0..1....0..0..0..0
..0..3..3..0....2..3..2..0....0..2..3..0....1..2..3..1....0..0..0..0
..1..3..3..1....1..2..1..1....0..3..1..1....0..1..0..2....1..2..1..2
..1..2..1..2....1..0..2..3....3..1..0..2....2..1..2..3....0..1..0..3
..0..2..0..3....3..3..1..2....1..0..2..3....1..0..1..0....2..2..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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