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A263583
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Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 filled by rows with each element moved a city block distance of 1 or 2, and rows and columns in increasing lexicographic order.
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1
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6, 134, 3035, 69084, 1643235, 38562523, 903637375, 21206120278, 497781904012, 11682193577941, 274165517770655, 6434456922985871, 151011586126096748, 3544112130933243384, 83177316133805461631, 1952101836234127241441
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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 84 (see link above)
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EXAMPLE
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Some solutions for n=4
..1..3..4....1..3..8....2..3..5....2..5..8....1..2..8....1..2..4....2..4..5
..6..0..2....6..0..2....6..0..7....6..0..1....5..0..3....6..0..8....6..0..3
..7.11.14...10..5..4....9..1.14...10..3..4....9.10..6....9..3..5...10..1.14
.12..8..5...13..9..7...12..4..8...13.12..7...11..4.14...11..7.10...12..7..8
.13..9.10...14.11.12...13.10.11...14..9.11...13..7.12...13.14.12...13..9.11
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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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