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A264421
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Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.
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0
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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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EXAMPLE
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Some solutions for n=3
.15..9..7..2.12..4..5....8..9.10.11.12..4..5....8..9..1.18.12..4..5
..0..1.17..3.19.20..6....0.16.24..3.19.20..6....0.16..2..3.19.20..6
.22..8.24.25.11.27.13....7.23.21..1..2.27.13....7.23.21.25.11.27.13
.14.21.16.23.18.10.26...14.15.22.17.18.25.26...14.15.22.17.24.10.26
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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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