A208306 Number of 6 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, 203, 678570, 46538017584, 17131843186425504, 21183598567292002167082, 67939294184937980415465539016, 479196921365748673300774676923278618, 6626004995909411145707148239379062019989108, 164986885310084515129040822858386474548745376110410

Offset: 0

Author

R. H. Hardin, Feb 25 2012

Keywords

• nonn

Examples

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

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..50

Crossrefs

Row 6 of A208301.

Extensions

a(0)=1 prepended and terms a(6) and beyond from Andrew Howroyd, May 18 2020