A197776 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,1,1,1 for x=0,1,2,3,4

1, 5, 67, 3021, 384758, 153517349, 186804530634, 694775899316423

Offset

1,2

Comments

Every 0 is next to 0 3'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

Diagonal of A197782

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A113064 A352860 A291807 * A197606 A207979 A129963

Adjacent sequences: A197773 A197774 A197775 * A197777 A197778 A197779

Keyword

nonn

Author

R. H. Hardin Oct 18 2011

Status

approved