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A299303
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Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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2, 52, 223, 1024, 5360, 28374, 144040, 743640, 3857242, 19925599, 102977350, 532709362, 2754912665, 14246433006, 73680910336, 381067786735, 1970816457786, 10192855468940, 52716573704127, 272645676769182, 1410103205704342
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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..0..1..1. .0..0..0..0. .0..0..0..1. .0..1..1..1. .0..0..1..0
..0..0..1..1. .0..1..1..1. .1..0..1..1. .0..1..1..1. .1..1..0..1
..0..0..0..0. .0..1..1..1. .0..1..0..0. .1..0..1..1. .1..1..1..1
..0..0..0..1. .1..0..1..1. .1..0..0..0. .1..0..1..1. .1..1..1..0
..1..1..1..0. .1..0..1..1. .1..0..0..0. .1..0..1..1. .0..0..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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