A197544 Number of n X 7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.

9, 119, 270, 2081, 6279, 48014, 223832, 1258673, 6255191, 36099651, 182317148, 1002566978, 5243822530, 28535482208, 150520120228, 809991814859, 4299042626683, 23075139229373, 122959297359243, 658044273422935

Offset

1,1

Comments

Every 0 is next to 0 2's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's.

Column 7 of A197545.

Links

R. H. Hardin, Table of n, a(n) for n = 1..155

Example

Some solutions containing all values 0 to 4 for n=4
..1..2..2..1..3..1..2....1..2..2..1..3..1..1....0..0..0..1..2..2..1
..0..1..1..3..1..3..1....0..1..1..4..1..2..2....1..1..1..3..1..1..3
..1..4..1..2..2..2..1....0..0..3..1..1..3..1....2..2..2..2..1..4..1
..2..1..3..1..1..1..0....0..0..1..2..2..1..0....1..1..1..1..3..1..2

Crossrefs

Cf. A197545.

Sequence in context: A322928 A340236 A087984 * A234964 A210046 A130652

Adjacent sequences: A197541 A197542 A197543 * A197545 A197546 A197547

Keyword

nonn

Author

R. H. Hardin, Oct 16 2011

Status

approved