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A275232
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Number of 7Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,0) and new values introduced in order 0..2.
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1
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32, 404, 8134, 164645, 3334854, 67550874, 1368326231, 27717164160, 561446064338, 11372797129197, 230370331746218, 4666441245648374, 94524645450606455, 1914715759242977500, 38784979537110927630, 785638615177198244373
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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) = 20*a(n-1) +57*a(n-2) -1206*a(n-3) +3096*a(n-4) +2306*a(n-5) -16957*a(n-6) +20440*a(n-7) -7755*a(n-8) for n>9
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EXAMPLE
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Some solutions for n=4
..0..1..0..2. .0..1..0..2. .0..0..0..1. .0..1..0..0. .0..1..0..0
..1..0..1..1. .2..0..1..0. .1..2..1..0. .2..2..1..2. .1..2..1..2
..0..2..0..2. .0..1..0..1. .2..1..2..1. .0..1..2..1. .2..1..2..1
..2..0..2..0. .2..0..2..0. .1..2..1..0. .1..0..0..2. .1..2..1..2
..0..2..0..2. .0..2..0..1. .2..1..2..1. .2..1..2..1. .2..1..2..1
..2..0..2..0. .1..0..2..0. .1..2..1..2. .1..2..1..2. .1..2..1..0
..1..2..1..1. .0..1..0..1. .2..1..2..1. .2..1..0..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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