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 A223371 3X3 square grid graph coloring a rectangular array: number of n X n 0..8 arrays where 0..8 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph 1
 9, 144, 13232, 6443888, 16589428016, 225311165173648, 16140699524652927296, 6098229223691941744426928, 12151193017016158174782862182736, 127692018720217712216017457942508673456 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A223379 LINKS R. H. Hardin, Table of n, a(n) for n = 1..11 EXAMPLE Some solutions for n=3 ..2..1..4....1..4..5....4..1..4....4..3..6....4..3..4....1..4..1....8..7..8 ..1..4..1....2..5..4....7..4..5....1..4..7....7..4..5....4..3..4....5..8..5 ..4..5..2....5..8..7....4..5..4....2..5..4....4..5..8....3..4..1....8..7..8 Vertex neighbors: 0 -> 1 3 1 -> 0 2 4 2 -> 1 5 3 -> 0 4 6 4 -> 3 1 5 7 5 -> 4 2 8 6 -> 3 7 7 -> 6 4 8 8 -> 7 5 CROSSREFS Sequence in context: A162993 A094594 A173213 * A046529 A331329 A064091 Adjacent sequences:  A223368 A223369 A223370 * A223372 A223373 A223374 KEYWORD nonn AUTHOR R. H. Hardin Mar 19 2013 STATUS approved

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Last modified December 5 06:52 EST 2021. Contains 349543 sequences. (Running on oeis4.)