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A241116
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Number of nX4 0..3 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..3 introduced in row major order
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1
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15, 2614, 587555, 134229632, 30679522712, 7012241396116, 1602748583683541, 366331237082570675, 83730272300093086129, 19137757826895828304001, 4374209764040662469308200, 999788545392696494568265298
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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 74 (see link above)
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EXAMPLE
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Some solutions for n=2
..0..1..1..1....0..1..2..0....0..1..2..0....0..1..1..2....0..1..2..1
..2..3..2..3....2..3..2..3....0..1..0..1....1..1..2..0....2..2..2..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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