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).

15, 1657, 5252041, 80318704605, 3662498214110836, 387950830575476495043, 81811898713607232898679186, 30915192640251267259536636853106, 19388812191991157504565482403825817325, 19036318336696557481934278608884237849314405

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