A197425 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,1,1 for x=0,1,2,3,4

1, 9, 68, 5197, 720447, 337295264, 529968166606, 2583340386672393

Offset

1,2

Comments

Every 0 is next to 0 4's, every 1 is next to 1 0'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 A197431

Links

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

Example

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

Crossrefs

Sequence in context: A024119 A348590 A120306 * A089379 A193698 A188800

Adjacent sequences: A197422 A197423 A197424 * A197426 A197427 A197428

Keyword

nonn

Author

R. H. Hardin Oct 14 2011

Status

approved