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A316451
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Number of nX4 0..1 arrays with every element unequal 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, 10, 23, 48, 229, 850, 3223, 10880, 45692, 175031, 633752, 2571686, 9904681, 37484676, 148315504, 573843418, 2209226947, 8646079404, 33532139222, 129892215361, 506136051248, 1965179506521, 7628724478673, 29676160150437
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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..1..0. .0..1..1..1. .0..1..0..0. .0..0..0..0. .0..0..1..1
..0..1..1..0. .0..1..1..0. .1..0..0..1. .1..0..0..1. .1..1..1..0
..1..1..1..1. .1..1..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..1
..0..1..1..0. .0..1..1..0. .1..0..0..0. .0..0..0..1. .0..0..1..1
..1..1..0..1. .1..1..1..1. .0..0..1..0. .0..1..0..0. .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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