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A280960
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Number of nX7 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.
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1
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224, 23593, 402077, 9986376, 251270618, 6052621154, 148137367471, 3624578433814, 88500510514256, 2162800206884214, 52848406746190667, 1291317121466531838, 31553229218022226192, 770996700142671487457
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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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EXAMPLE
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Some solutions for n=2
..0..1..2..0..2..1..2. .0..1..2..0..1..0..2. .0..1..0..1..2..1..0
..0..2..1..2..0..2..0. .2..0..1..0..1..0..1. .0..1..2..0..2..0..2
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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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