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A305011
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Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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2, 10, 31, 42, 255, 862, 2200, 8807, 33055, 106158, 385363, 1430563, 4984613, 17903390, 65557446, 234669342, 845691032, 3078003683, 11115610686, 40193431243, 145975752428, 528747707176, 1915566040755, 6952384042215
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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=5
..0..1..0..0. .0..0..0..1. .0..0..0..1. .0..1..0..1. .0..0..1..1
..0..0..0..1. .0..1..1..1. .1..0..0..1. .0..0..1..1. .0..1..0..1
..0..0..0..0. .0..0..0..1. .0..0..0..0. .1..0..1..0. .0..1..1..1
..1..0..0..1. .0..0..0..1. .1..0..0..1. .0..1..0..1. .0..0..1..1
..0..0..0..0. .0..1..1..1. .0..0..0..1. .0..0..1..1. .0..1..0..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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