A183360 One quarter the number of nX8 1..4 arrays with no two neighbors of any element equal to each other.

2916, 147456, 104976, 166464, 331776, 746496, 1806336, 4460544, 9437184, 19501056, 40144896, 84934656, 180633600, 391090176, 840536064, 1816805376, 3893760000, 8387629056, 17960288256, 38654705664, 82833444864, 178259595264

Offset: 1

Author

R. H. Hardin Jan 04 2011

Keywords

• nonn

Comments

Column 8 of A183362

Examples

			Some solutions for 5X8 with a(1,1)=1
..1..2..2..3..1..2..2..1....1..2..4..4..1..2..4..4....1..3..4..1..2..2..4..3
..1..3..4..4..1..3..4..4....1..3..3..2..1..3..3..2....2..2..4..1..3..3..4..1
..4..3..1..2..2..3..1..2....4..4..1..2..4..4..1..2....4..1..3..2..4..1..2..2
..2..2..1..3..4..4..1..2....2..2..1..3..3..2..1..3....4..1..3..2..4..1..3..3
..3..4..4..3..1..2..3..4....3..3..4..4..1..2..4..4....2..2..4..1..3..2..4..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..38