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A299875
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Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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8, 29, 41, 125, 585, 1974, 6542, 24545, 89192, 314259, 1128245, 4079503, 14634597, 52444291, 188594973, 678001937, 2434026544, 8742984292, 31418755932, 112865079546, 405419489351, 1456549048305, 5232786086738, 18798220721187
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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 67 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..1..0..1. .0..1..0..1. .0..1..0..0. .0..1..0..0. .0..1..0..0
..0..1..0..1. .0..1..0..0. .0..1..0..1. .0..1..0..1. .1..1..0..1
..1..1..1..0. .0..1..0..0. .1..0..0..0. .1..0..0..0. .1..1..1..1
..0..0..1..1. .1..0..0..1. .1..0..1..1. .0..1..0..0. .1..1..1..1
..1..1..0..0. .1..0..1..0. .0..1..0..0. .0..1..0..1. .0..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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