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A280358
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Number of n X 3 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors and with new values introduced in order 0 sequentially upwards.
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1
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4, 50, 571, 6727, 78800, 924579, 10844773, 127214104, 1492251709, 17504551617, 205333329586, 2408618523801, 28253780677867, 331424891961162, 3887708335839063, 45603925604339175, 534947030615649624
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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) = 10*a(n-1) +26*a(n-2) -58*a(n-3) -99*a(n-4) -63*a(n-5) -25*a(n-6) +229*a(n-7) -3*a(n-8) -16*a(n-9) +12*a(n-10) +16*a(n-12).
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EXAMPLE
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Some solutions for n=4
..0..1..1. .0..0..1. .0..1..0. .0..1..2. .0..1..2. .0..0..1. .0..1..2
..2..0..2. .2..2..0. .1..2..1. .2..0..1. .2..0..2. .2..2..0. .1..2..1
..1..0..2. .0..1..1. .1..0..0. .2..1..2. .0..1..0. .0..0..2. .0..2..0
..0..2..0. .2..0..0. .0..1..2. .1..0..1. .1..2..1. .1..1..0. .0..1..0
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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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