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A300535
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Number of nX4 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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1, 16, 36, 300, 1436, 8974, 52012, 311037, 1845926, 11005063, 65583577, 390991796, 2331383710, 13900965032, 82892406341, 494278699068, 2947415376806, 17575447550343, 104803246864144, 624945156416678, 3726574928599652
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 75 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..0..1. .0..0..1..1. .0..1..0..0. .0..0..0..0. .0..0..0..1
..0..0..1..1. .0..1..1..1. .1..1..0..1. .0..1..1..0. .0..1..0..0
..1..1..0..0. .0..0..0..0. .1..1..1..1. .1..1..0..0. .1..1..0..0
..1..1..0..0. .1..1..0..1. .0..0..0..1. .1..0..1..0. .1..1..0..1
..1..1..0..0. .1..1..1..1. .0..0..1..1. .0..0..0..0. .0..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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