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A299510
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Number of n X 4 0..1 arrays with every element equal to 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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2, 13, 29, 112, 439, 1950, 7702, 30277, 126429, 518642, 2100761, 8578886, 35145230, 143528336, 585829218, 2394199252, 9784418458, 39968678821, 163285521413, 667170458474, 2725830500324, 11136404253818, 45499237305554
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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 68 (see link above).
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EXAMPLE
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Some solutions for n=5
..0..1..1..0. .0..0..0..1. .0..1..1..1. .0..1..1..0. .0..1..1..0
..0..0..0..1. .1..1..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..1
..0..0..0..1. .0..1..1..1. .0..0..0..1. .0..0..0..0. .0..0..0..1
..0..0..0..0. .0..1..1..1. .0..0..0..1. .0..0..0..0. .0..0..0..1
..0..1..1..1. .1..0..0..1. .0..1..1..0. .0..1..1..0. .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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