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A223440
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T(n,k)=Generalized Petersen graph (8,2) coloring a rectangular array: number of nXk 0..15 arrays where 0..15 label nodes of a graph with edges 0,1 0,8 8,14 8,10 1,2 1,9 9,15 9,11 2,3 2,10 10,12 3,4 3,11 11,13 4,5 4,12 12,14 5,6 5,13 13,15 6,7 6,14 7,0 7,15 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph
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8
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16, 48, 48, 144, 256, 144, 432, 1376, 1376, 432, 1296, 7424, 14112, 7424, 1296, 3888, 40160, 147520, 147520, 40160, 3888, 11664, 217600, 1562176, 3099264, 1562176, 217600, 11664, 34992, 1180256, 16693920, 67182208, 67182208, 16693920, 1180256
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OFFSET
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1,1
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COMMENTS
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Table starts
.....16........48..........144.............432...............1296
.....48.......256.........1376............7424..............40160
....144......1376........14112..........147520............1562176
....432......7424.......147520.........3099264...........67182208
...1296.....40160......1562176........67182208.........3049973040
...3888....217600.....16693920......1485628224.......142702806112
..11664...1180256....179532768.....33277934848......6790055219264
..34992...6405888...1939216640....751557814208....326095786136512
.104976..34782688..21008925952..17060996532992..15740601974728144
.314928.188912640.228065409888.388541047749184.761894144429277728
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = 3*a(n-1)
k=2: a(n) = 8*a(n-1) -11*a(n-2) -16*a(n-3)
k=3: a(n) = 15*a(n-1) -18*a(n-2) -310*a(n-3) +167*a(n-4) +475*a(n-5) -244*a(n-6) -100*a(n-7) +48*a(n-8)
k=4: [order 14]
k=5: [order 36]
k=6: [order 75]
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EXAMPLE
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Some solutions for n=3 k=4
..7.15..7..0....1..0..7..0...10..8.14.12....8.14.12.10....9..1..9.11
..6..7..6..7....2..1..0..7...12.10.12.14...14.12.10..8....1..9.11..9
..7.15..7.15...10..2..1..0...14..8.14..8....8.14.12.14....9..1..9..1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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