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

1,1

Links

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

Example

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

Crossrefs

Column 5 of A207868.

Sequence in context: A140285 A208401 A198911 * A206513 A271404 A271405

Adjacent sequences: A207864 A207865 A207866 * A207868 A207869 A207870

Keyword

nonn

Author

R. H. Hardin, Feb 21 2012

Extensions

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

Status

approved