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A264381
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Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.
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1
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1, 13, 80, 385, 2345, 14329, 88264, 538417, 3284212, 20034334, 122324128, 746763789, 4557854384, 27820780958, 169811407936, 1036520322168, 6326740063001, 38617694163183, 235716525841304, 1438783215929873
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 70 (see link above)
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EXAMPLE
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Some solutions for n=4
..1..6..5..8..7....1..2..5..4..9....5..2..7..4..9....5..2..3..8..7
..0.11..2.13.12....0..7..8..3.12....0..1..8..3.12....0..1.12..9..4
.15..3..4.16..9...15..6.17.16.19...15..6.13.16.17...15..6.13.16.17
.10.17.18.19.14...10.11.18.13.14...10.11.18.19.14...10.11.18.19.14
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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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