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A222569
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Number of n X 4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
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1
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4, 10, 56, 435, 4790, 50535, 547563, 5815939, 63130202, 676152734, 7328771224, 79083695286, 857913193954, 9302185273377, 101073333908828, 1099637763169027, 11970412457540599, 130557727722965457, 1423911243991041430
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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..0..0..0....0..0..0..0....0..1..2..2....0..0..0..1
..0..0..0..0....0..0..0..0....0..0..0..0....2..2..2..2....0..0..0..0
..1..0..2..0....0..0..0..1....0..0..1..0....2..2..2..2....0..0..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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