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A222138
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Number of nX2 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero
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2
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4, 52, 676, 8788, 114244, 1485172, 19307236, 250994068, 3262922884, 42417997492, 551433967396, 7168641576148, 93192340489924, 1211500426369012, 15749505542797156, 204743572056363028, 2661666436732719364
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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: a(n) = 13*a(n-1)
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EXAMPLE
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Some solutions for n=3
..0..1....0..2....0..3....0..2....0..3....0..1....0..3....0..3....0..1....0..1
..0..3....0..0....3..3....0..2....0..0....2..2....1..1....1..1....3..3....0..2
..0..0....0..3....4..0....0..0....0..3....0..3....1..3....2..4....4..0....3..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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