A198912 Number of n X 6 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor.

52, 313132, 13088156547, 769126451071174, 46891073386615240710, 2869765342757082981876352, 175702802690666247458883923440, 10757955551509190096324218697545253, 658692627650592744502193427291859810016, 40330729100674101491606403206098933746439983

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..3..4....0..1..0..2..3..4....0..1..2..1..3..2....0..1..2..1..3..1
..1..0..1..5..0..6....1..0..2..5..4..0....1..0..1..4..5..6....1..0..1..0..1..0
..0..1..4..7..6..7....0..1..5..0..6..7....0..1..0..7..3..0....0..1..4..5..6..7
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..200

Crossrefs

Column 6 of A198914.

Extensions

Terms a(7) and beyond from Andrew Howroyd, Mar 12 2023