A195963 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to itself

1, 1, 5, 21, 193, 746, 13302, 230806, 8567404, 292294619

Offset

1,3

Comments

Diagonal of A195969

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..2..2..2..2....1..0..1..1....0..2..2..2....0..1..1..0....2..2..2..0
..2..0..1..2....1..2..2..0....2..2..1..2....2..2..2..2....2..1..2..1
..2..2..1..2....0..2..2..1....2..0..1..2....2..1..1..2....2..1..2..1
..0..2..2..2....1..1..0..1....2..2..2..2....2..2..2..2....2..2..2..0

Crossrefs

Sequence in context: A123334 A140196 A027160 * A119686 A241467 A267020

Adjacent sequences: A195960 A195961 A195962 * A195964 A195965 A195966

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved