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A300092
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Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 18, 19, 56, 203, 672, 2168, 7287, 25652, 88027, 306375, 1070802, 3744286, 13105674, 45926952, 161012379, 564504898, 1979855821, 6944885024, 24362969123, 85473134558, 299883787584, 1052181830655, 3691806167058, 12953760142043
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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 71 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..1..0..1. .0..1..0..0. .0..0..1..1. .0..0..1..1
..0..0..0..0. .1..1..1..1. .0..0..0..1. .0..0..1..1. .0..0..1..0
..0..0..0..0. .0..0..0..1. .0..1..1..1. .0..0..0..0. .1..1..1..1
..1..1..0..0. .0..1..1..0. .1..0..0..0. .1..1..0..0. .0..1..1..0
..0..1..0..0. .1..1..0..0. .1..1..0..1. .0..1..0..0. .1..1..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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