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A222720
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Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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6, 666, 88552, 12956013, 1928517786, 289452236157, 43727219083464, 6642633038715993, 1013931851324206903, 155405622159690335817, 23903771940011196629121, 3688080815279058966399672
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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 n=3
..0..1..2..0....0..1..0..0....0..1..2..2....0..1..0..1....0..1..2..0
..2..0..3..0....2..3..2..1....3..0..2..1....0..0..0..2....3..0..0..1
..1..0..0..0....0..2..3..3....1..0..2..3....0..2..3..1....2..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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