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A280670
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Number of nX5 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.
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1
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30, 1917, 119440, 7533245, 474736149, 29920114246, 1885698283255, 118845116023725, 7490149091439288, 472062591963218273, 29751489321018113345, 1875071509361980884750, 118175366862571989996619
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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: a(n) = 59*a(n-1) +268*a(n-2) -869*a(n-3) -2331*a(n-4) +3754*a(n-5) -8240*a(n-6) -88*a(n-7) -3472*a(n-8) for n>9
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EXAMPLE
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Some solutions for n=3
..0..1..2..1..2. .0..1..2..1..1. .0..0..1..2..0. .0..1..2..0..2
..0..0..2..0..2. .2..1..0..0..2. .2..2..0..2..2. .0..1..0..1..1
..2..0..2..0..0. .1..2..2..1..0. .0..2..0..0..1. .1..2..0..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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