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A264208
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Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 1,0.
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1
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9, 96, 1024, 7328, 52441, 422505, 3404025, 26420400, 205062400, 1610785200, 12652875225, 99005135055, 774686906569, 6069420974096, 47551947307264, 372398730656880, 2916406634175225, 22842723404402325, 178915383889049025
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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 92 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..1..7..3..9....0..3..2..8..4....0..3..2..1..9....0..3..2..1..4
.10..6..2..8..4....5..1..7..6..9....5.11..7.13..4....5..6.12.13..9
..5.11.12.13.14...12.11.10.13.14...10..6.12..8.14...10.11..7..8.14
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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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