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 A223694 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 or antidiagonal neighbor moves along an edge of this graph 1
 4096, 3888, 37008, 363600, 3788640, 40075632, 427910688, 4599435024, 49661922528, 537886587312, 5838098127264, 63455538372048, 690372511036128, 7515830878003440, 81857442742673184, 891795388496947344 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A223692 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 13*a(n-1) +15*a(n-2) -391*a(n-3) -399*a(n-4) +1739*a(n-5) +205*a(n-6) -2013*a(n-7) +580*a(n-8) +396*a(n-9) -144*a(n-10) for n>12 EXAMPLE Some solutions for n=3 .15..7..0...11..3..4....5.13.15....0..1..0....9.11.13...15.13.15....7..6..7 .15..7.15...11..3..4....5.13..5....0..1..0...13..5..6....5.13.15....7.15.13 .15..7..6...11..3..4....5.13.11....0..1..2....6..5..6...15..9..1....9.11.13 CROSSREFS Sequence in context: A176768 A223601 A186490 * A186489 A221261 A069273 Adjacent sequences:  A223691 A223692 A223693 * A223695 A223696 A223697 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2013 STATUS approved

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Last modified September 22 07:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)