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A208019
Number of n X 4 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
5, 87, 27093, 30066912, 80318704605, 421673189900658, 3840411377316733859, 55738840149772892317910, 1212109474086951274342594323, 37684550247867169399313491413883, 1614317526939802578784333734266333582, 92481709137707355217408169152041892948306
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..2..3..0..3....2..3..2..3....2..3..2..3....2..3..2..3....2..3..2..3
..0..4..1..2....4..0..5..0....0..1..0..1....0..1..0..4....0..1..4..0
..1..2..3..4....1..2..3..1....4..2..3..5....2..3..2..1....2..3..2..1
CROSSREFS
Column 4 of A208021.
Sequence in context: A216088 A305001 A324092 * A297529 A300135 A221465
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
EXTENSIONS
Terms a(8) and beyond from Andrew Howroyd, Jun 25 2017
STATUS
approved