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A299093
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Number of n X 4 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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8, 29, 41, 125, 574, 1847, 6007, 22330, 78424, 268599, 949084, 3349021, 11698218, 41025548, 144230504, 506030772, 1774857783, 6230482209, 21869669571, 76741039322, 269319672263, 945257932761, 3317391481932, 11642270682192
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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 68 (see link above).
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EXAMPLE
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Some solutions for n=5
..0..1..1..0. .0..0..1..0. .0..0..1..1. .0..1..1..1. .0..1..0..0
..1..1..1..1. .1..1..1..0. .1..0..1..0. .0..1..0..1. .0..1..1..1
..1..1..1..1. .1..0..1..1. .0..0..0..0. .1..1..1..1. .1..1..1..0
..0..1..1..0. .1..1..0..0. .0..0..1..1. .1..1..0..0. .0..0..0..1
..0..0..1..0. .0..0..1..0. .1..0..1..0. .0..1..0..1. .1..0..0..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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