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

1,1

Links

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

Example

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

Crossrefs

Column 7 of A198914.

Sequence in context: A208471 A348823 A198722 * A224983 A138605 A260975

Adjacent sequences: A198910 A198911 A198912 * A198914 A198915 A198916

Keyword

nonn

Author

R. H. Hardin, Oct 31 2011

Extensions

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

Status

approved