A208305 Number of 5 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).

1, 52, 21147, 113503692, 2475181138384, 148049849095504726, 19558496206477343793824, 4971673449365938875551493054, 2209363673053161750976745846408452, 1599235210372714053663919266990430641290, 1785670329039896818784300269276903576597674264

Offset: 0

Author

R. H. Hardin, Feb 25 2012

Keywords

• nonn

Examples

			Some solutions for n=4:
..0..1..0..1....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
..0..1..0..1....0..1..0..1....3..0..1..0....0..1..0..1....0..2..0..1
..0..1..2..0....0..1..0..1....4..0..1..0....0..1..0..1....0..1..0..1
..0..1..2..0....0..1..2..0....1..2..1..0....0..2..0..1....0..2..0..1
..0..1..2..3....0..1..2..0....0..2..1..4....0..1..0..1....0..1..2..0
		

Links

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

Crossrefs

Row 5 of A208301.

Extensions

a(0)=1 prepended and terms a(7) and beyond from Andrew Howroyd, May 18 2020