A207867 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 or vertical neighbor (colorings ignoring permutations of colors).

15, 10900, 68162042, 1625686993918, 103204230192540988, 14231913620170652461908, 3737733535781386231895815398, 1704434626479905430949721771156450, 1259921002642906004433313180012192804586, 1431587436371216664854796169984729275373681588

Offset: 1

Author

R. H. Hardin, Feb 21 2012

Keywords

• nonn

Examples

			Some solutions for n=5
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..1..0..1..0..1....1..0..1..0..1....2..0..1..0..1....1..0..1..0..1
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..1..0..1..0..1....2..0..1..0..1....1..0..1..2..1....1..2..1..0..1
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..100

Crossrefs

Column 5 of A207868.

Extensions

Terms a(6) and beyond from Andrew Howroyd, Mar 11 2023