A198913 Number of n X 7 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor.

203, 10856948, 3352514013159, 1243368053336112649, 467181941240736711604077, 175702802690666247458883923440, 66084692925071529966599521403836686, 24855655340700384655492554800723374323095, 9348667576846602621032033514210811069676125541

Offset: 1

Author

R. H. Hardin, Oct 31 2011

Keywords

• nonn

Examples

			Some solutions with values 0 to 7 for n=3
..0..1..0..2..0..1..3....0..1..0..2..3..4..2....0..1..0..2..0..1..3
..1..0..2..0..4..2..5....1..0..2..0..4..5..0....1..0..2..0..4..3..5
..0..1..0..6..7..3..0....0..1..0..4..5..6..7....0..1..0..6..7..0..1
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..150

Crossrefs

Column 7 of A198914.

Extensions

Terms a(8) and beyond from Andrew Howroyd, Mar 12 2023