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A208020 Number of n X 5 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). 2
15, 1657, 5252041, 80318704605, 3662498214110836, 387950830575476495043, 81811898713607232898679186, 30915192640251267259536636853106, 19388812191991157504565482403825817325, 19036318336696557481934278608884237849314405 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..1..0....0..1..2..0..1....0..1..0..1..0....0..1..0..1..0
..2..3..2..3..4....2..3..4..3..2....2..3..2..3..2....2..3..2..3..2
..0..4..1..0..1....1..0..1..0..1....0..1..0..1..0....0..1..4..0..1
..2..3..2..3..2....2..3..2..3..2....2..3..2..3..2....2..3..2..3..2
CROSSREFS
Column 5 of A208021.
Sequence in context: A281801 A208000 A182925 * A205423 A263600 A208860
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
EXTENSIONS
Terms a(6) and beyond from Andrew Howroyd, Jun 25 2017
STATUS
approved

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Last modified April 19 17:51 EDT 2024. Contains 371797 sequences. (Running on oeis4.)