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A233630
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Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6
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1
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4974, 150054, 4350820, 130732438, 3912088926, 117571581104, 3530630987208, 106103463522318, 3187954907098334, 95800942354485530, 2878719458096776464, 86506426202241796704, 2599495648181112747454, 78115122641805183994432
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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 recurrence of order 63 (see link above)
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EXAMPLE
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Some solutions for n=2
..0..3..2..3....2..0..0..3....0..3..0..1....1..0..3..0....2..0..0..2
..0..1..0..3....3..3..0..3....3..3..2..3....3..0..0..0....3..3..3..3
..1..3..2..3....0..3..1..3....3..0..0..1....2..2..3..1....2..0..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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