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A222336
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Number of n X 3 0..6 arrays with no entry increasing mod 7 by 6 rightwards or downwards, starting with upper left zero.
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2
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36, 5766, 923526, 147918906, 23691810366, 3794659477146, 607781352505806, 97346856728146986, 15591808593304758846, 2497301950787699442426, 399986762028752524653486, 64064904024834487199387466
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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) = 165*a(n-1) - 774*a(n-2).
Empirical g.f.: 6*x*(6 - 29*x) / (1 - 165*x + 774*x^2). - Colin Barker, Mar 15 2018
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EXAMPLE
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Some solutions for n=3:
..0..0..2....0..0..1....0..0..1....0..0..2....0..0..3....0..0..2....0..0..5
..3..3..0....0..1..2....1..2..5....1..1..6....2..2..5....3..0..3....0..3..6
..1..1..4....5..3..6....6..6..1....4..1..2....4..0..0....0..3..4....3..5..3
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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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