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A234061
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Number of (n+2)X(1+2) 0..3 arrays with no increasing sequence of length 3 horizontally or diagonally downwards
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1
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205808, 11758836, 671548560, 38351813588, 2190245258368, 125083358211012, 7143421916769712, 407955761112088052, 23298064277080047968, 1330535932548632543396, 75985963758367046917776
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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) = 60*a(n-1) -139*a(n-2) -1552*a(n-3) +3544*a(n-4) +640*a(n-5) -4720*a(n-6) +2048*a(n-7)
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EXAMPLE
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Some solutions for n=1
..1..3..2....0..0..0....0..1..0....0..0..2....1..1..0....0..3..1....2..0..1
..2..1..2....0..3..3....2..3..1....0..0..2....1..2..2....0..0..2....3..1..3
..3..3..1....0..2..1....3..3..3....2..1..0....0..3..2....1..1..0....1..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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