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A222612
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Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal 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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4, 12, 65, 567, 5746, 85511, 1409334, 23117220, 385330520, 6476514601, 108758391488, 1826675971872, 30708013301383, 516416025560708, 8686858217305854, 146176023166781075, 2460556661008587521
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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..0..0..0....0..1..1..1....0..0..0..0....0..1..0..0....0..0..1..1
..1..0..0..0....1..1..1..1....1..0..0..0....2..0..0..0....2..1..1..1
..2..0..0..0....1..1..1..2....0..0..0..0....0..0..0..0....1..1..1..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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