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A299245
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Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 18, 18, 55, 192, 652, 2002, 6741, 23631, 79836, 274822, 954282, 3306096, 11462662, 39849725, 138545796, 481560761, 1674865229, 5826326576, 20267377567, 70508970351, 245315398653, 853512851244, 2969629901018, 10332484940737
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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 72 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..1..1..0. .0..0..1..1. .0..0..1..1. .0..1..1..1. .0..1..1..0
..0..0..1..1. .0..0..1..1. .1..0..1..0. .0..0..1..0. .0..0..1..1
..1..1..1..0. .0..0..1..1. .1..1..0..0. .0..1..1..1. .1..1..0..1
..0..1..1..1. .1..1..1..1. .0..1..1..1. .1..1..1..0. .0..1..0..0
..1..1..0..1. .1..1..1..1. .1..1..0..1. .1..0..1..1. .1..1..1..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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