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A223435
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Generalized Petersen graph (8,2) coloring a rectangular array: number of nX3 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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1
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144, 1376, 14112, 147520, 1562176, 16693920, 179532768, 1939216640, 21008925952, 228065409888, 2479179661472, 26974655289536, 293678536506304, 3198664399776288, 34848651790913888, 379738193353123456
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OFFSET
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1,1
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COMMENTS
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Column 3 of A223440
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: 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)
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EXAMPLE
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Some solutions for n=3
.13.11.13....9.11..9...12..4..5....9.15.13....6..5.13....5..6.14....6..5..6
.15..9.11....1..9..1....4..3..4...15..9.11....7..6..5....6.14.12....5..6..7
.13.11.13....0..1..2....5..4.12....9.15.13....0..7..6...14.12.14....6.14..6
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CROSSREFS
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Sequence in context: A203819 A222515 A023096 * A169859 A137416 A109117
Adjacent sequences: A223432 A223433 A223434 * A223436 A223437 A223438
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Mar 20 2013
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STATUS
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approved
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