A198721 Number of nX6 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor.

52, 272410, 5315840795, 116492275674072, 2572072097029554676, 56817439251356046537693, 1255145613308486512244031328, 27727293796669883715931085888092, 612520905593913038338760996059873808

Offset: 1

Author

R. H. Hardin Oct 29 2011

Keywords

• nonn

Comments

Column 6 of A198723

Examples

			Some solutions with all values 0 to 6 for n=3
..0..1..2..3..4..2....0..1..2..1..2..3....0..1..2..3..4..2....0..1..0..2..3..0
..1..0..1..2..3..5....1..0..1..4..3..5....1..0..1..2..1..3....1..0..1..3..4..2
..0..1..0..1..6..0....0..1..0..6..5..4....0..1..0..5..6..4....0..1..3..4..5..6
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..11