A208300 Number of n X 6 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, 373780, 33093356640, 14216420563705724, 19558496206477343793824, 67939294184937980415465539016, 510275358863420934339418249390485008, 7427072102775408021555037479377677353344288, 193059270325130351714478780835691676245238854091968

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..1....0..1..0..1..0..1....0..1..0..1..2..1
..0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..3..0..1
..2..1..3..1..0..1....2..1..2..1..0..1....0..1..0..1..0..1....0..1..0..2..3..0
..0..1..0..1..2..0....2..0..2..3..0..1....0..1..0..1..0..1....0..1..0..1..2..0
		

Links

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

Crossrefs

Column 6 of A208301.

Extensions

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