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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

Andrew Howroyd, Table of n, a(n) for n = 1..50

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

Adjacent sequences:  A208017 A208018 A208019 * A208021 A208022 A208023

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 July 4 10:11 EDT 2022. Contains 355075 sequences. (Running on oeis4.)