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A299461
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Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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2, 52, 226, 1013, 5294, 27639, 139226, 713421, 3674765, 18853673, 96786807, 497418193, 2555599511, 13129374671, 67461650707, 346631157067, 1781036709459, 9151338992559, 47021631140929, 241607368725137, 1241433013500699
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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 69 (see link above)
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EXAMPLE
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Some solutions for n=6
..0..0..1..0. .0..1..0..0. .0..0..0..1. .0..1..0..1. .0..0..1..1
..1..1..1..0. .0..1..1..1. .0..0..0..1. .1..0..1..1. .1..0..0..0
..0..0..0..0. .1..1..1..1. .0..0..0..1. .0..0..0..0. .1..0..0..0
..0..1..1..1. .0..1..1..1. .0..0..0..0. .1..1..1..1. .1..0..0..0
..0..1..1..1. .0..1..0..0. .0..0..0..1. .1..1..1..1. .0..0..0..0
..0..1..1..1. .0..0..1..1. .1..1..1..0. .1..1..1..1. .0..1..1..1
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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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