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A187421
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Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants
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1
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609, 6512, 46764, 602024, 5254072, 56472058, 533853394, 5585054046, 54998694426, 562340568708, 5598043072500, 56738877828678, 568753193822092, 5743694780294918, 57708886492197048, 581740972471740850
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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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EXAMPLE
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Some solutions for 3X4
..2..1..0..1....0..0..0..1....2..2..0..2....0..2..2..2....1..0..2..0
..2..2..2..1....0..0..1..1....1..2..0..0....0..1..1..2....2..1..2..1
..0..1..2..0....2..0..2..1....0..2..0..0....1..1..0..2....1..1..0..1
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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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