A208094 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, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

1, 5, 377, 169064, 235862938, 746823293346, 4493602584256529, 45881957995776221396, 734971289403287420883126, 17434398033181126785548889533, 585880828202059360820577364423099, 26929433656271781956071918468836389588, 1645382407173932261418519657416983542506695

Offset: 0

Author

R. H. Hardin, Feb 23 2012

Keywords

• nonn

Examples

			Some solutions for n=4
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..0..1..0..2....0..1..0..1....0..1..2..1....0..1..0..1....0..1..0..2
..2..1..0..1....2..1..0..2....0..1..0..1....0..2..0..1....2..1..0..1
..0..1..2..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..2
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..100

Crossrefs

Column 4 of A208096.

Extensions

a(0)=1 prepended and terms a(8) and beyond from Andrew Howroyd, May 17 2020