A233025 Number of nX7 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.

729, 67449, 9997413, 1546718177, 245698677999, 39386531523609, 6338787392715565, 1021854400935817069, 164848602838755709211, 26602184763154679609107, 4293469218556492461639273

Offset: 1

Author

R. H. Hardin, Dec 03 2013

Keywords

• nonn

Comments

Column 7 of A233026

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210