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A280597
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Number of n X n 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.
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0
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1, 7, 45, 302, 1648, 7594, 31152, 119656, 446500, 1658080, 6210762, 23592940, 90908854, 354490210, 1394647332, 5520750316
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..1..1..0. .0..0..0..0. .0..1..1..0. .0..1..1..0. .0..0..0..0
..1..0..1..0. .1..1..1..0. .0..0..1..1. .1..0..0..1. .1..1..1..1
..1..0..1..0. .0..0..1..1. .1..0..0..0. .1..1..1..0. .0..0..0..0
..0..1..0..1. .1..0..0..1. .1..1..1..1. .0..0..0..1. .1..1..1..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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