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 A223601 Petersen graph (8,2) coloring a rectangular array: number of 3Xn 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, diagonal or antidiagonal neighbor moves along an edge of this graph 1
 4096, 1376, 16192, 122608, 1124064, 9902320, 90390720, 827854448, 7658651360, 71165672752, 663933249024, 6209221918896, 58174002355232, 545677201489648, 5122736643803840, 48118345117470448, 452153378054341216 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A223599 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 13*a(n-1) +3*a(n-2) -437*a(n-3) +544*a(n-4) +3614*a(n-5) -6064*a(n-6) -6480*a(n-7) +14240*a(n-8) -416*a(n-9) -7296*a(n-10) +2304*a(n-11) for n>12 EXAMPLE Some solutions for n=3 ..7.15..9...10.12.14....5..6.14...12.14.12....6..7..0...13.15.13....7..0..8 .13.15.13...14.12.14....7..6..5...12..4.12...15..7..6...13.15..7....1..0..7 .13.11..9...14.12.14...14..6.14...12.14.12...15..7..6....7.15..9....1..0..7 CROSSREFS Sequence in context: A182685 A182686 A176768 * A186490 A223694 A186489 Adjacent sequences:  A223598 A223599 A223600 * A223602 A223603 A223604 KEYWORD nonn AUTHOR R. H. Hardin Mar 23 2013 STATUS approved

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Last modified September 18 12:28 EDT 2020. Contains 337169 sequences. (Running on oeis4.)