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A264069
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Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 0,1 or 1,2.
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1
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233, 15125, 1445345, 130697424, 11909009849, 1084282319384, 98725402363225, 8989061417123964, 818464496640651553, 74522143720797473932, 6785327805998071795553, 617811983591878946983992
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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: a(n) = 87*a(n-1) +374*a(n-2) -470*a(n-3) +207*a(n-4) +3*a(n-5) for n>7
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EXAMPLE
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Some solutions for n=2
..9..1..2..3..4.13..6....0..1..2..3..4..5..6....8..9..2.12.13..5..6
.15..0.17.18.19.20..5....7.16.18.19.11.12.13...15..0.18..1.19..3..4
.14..7.16..8.10.11.12...14.15..8.17..9.10.20...14..7.16.17.10.11.20
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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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