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A233499
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Number of (2+2) X (n+2) 0..2 arrays with no increasing sequence of length 3 horizontally or antidiagonally downwards.
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1
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424009, 26851581, 1709348346, 108934667695, 6940835448966, 442240878862773, 28176593184596215, 1795219762788597690, 114378735336956365968, 7287404963779880864407, 464301857642373045877140
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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 recurrence of order 68 (see link above).
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EXAMPLE
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Some solutions for n=1
..0..0..0....0..2..0....0..0..1....0..0..1....0..0..1....0..1..0....0..1..1
..2..1..0....1..2..1....0..0..1....1..2..1....1..0..1....2..1..0....2..2..1
..1..1..1....1..1..1....0..0..1....1..2..0....0..0..2....1..0..0....0..0..1
..0..0..2....2..0..2....0..1..1....2..0..1....0..2..2....1..0..2....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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