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

1,1

Links

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

Example

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

Crossrefs

Column 6 of A198914.

Sequence in context: A070908 A198980 A198721 * A208300 A038778 A116107

Adjacent sequences: A198909 A198910 A198911 * A198913 A198914 A198915

Keyword

nonn

Author

R. H. Hardin, Oct 31 2011

Extensions

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

Status

approved