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 A223500 Petersen graph (3,1) coloring a rectangular array: number of nX4 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,3 3,5 3,4 1,2 1,4 4,5 2,0 2,5 and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an edge of this graph, with the array starting at 0 1
 27, 631, 16323, 426359, 11148439, 291545903, 7624417031, 199391762123, 5214442630935, 136366781617267, 3566229514618067, 93263130563653603, 2438993757290874987, 63783946691623236183, 1668061610819558039475 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A223504 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 31*a(n-1) -127*a(n-2) -20*a(n-3) +705*a(n-4) -1027*a(n-5) +499*a(n-6) -60*a(n-7) EXAMPLE Some solutions for n=3 ..0..1..4..1....0..1..2..1....0..3..5..4....0..3..0..3....0..1..0..3 ..4..3..4..3....4..1..4..5....5..3..5..3....4..3..4..1....0..1..4..1 ..0..3..0..1....4..5..2..1....0..3..5..2....5..3..0..1....0..3..4..3 CROSSREFS Sequence in context: A099753 A231292 A046359 * A060603 A116988 A113364 Adjacent sequences:  A223497 A223498 A223499 * A223501 A223502 A223503 KEYWORD nonn AUTHOR R. H. Hardin Mar 21 2013 STATUS approved

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Last modified August 9 12:14 EDT 2020. Contains 336323 sequences. (Running on oeis4.)