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 A223435 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 1
 144, 1376, 14112, 147520, 1562176, 16693920, 179532768, 1939216640, 21008925952, 228065409888, 2479179661472, 26974655289536, 293678536506304, 3198664399776288, 34848651790913888, 379738193353123456 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A223440 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA 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) EXAMPLE 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 CROSSREFS Sequence in context: A203819 A222515 A023096 * A169859 A137416 A109117 Adjacent sequences: A223432 A223433 A223434 * A223436 A223437 A223438 KEYWORD nonn AUTHOR R. H. Hardin Mar 20 2013 STATUS approved

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Last modified March 30 02:01 EDT 2023. Contains 361599 sequences. (Running on oeis4.)