A252953 Number of (n+2)X(n+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order

60, 120, 259, 674, 1747, 5100, 12573, 33929, 96273, 254784, 702943, 2032001

Offset

1,1

Comments

Diagonal of A252961

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=2
..0..0..1..0....0..1..1..2....0..1..1..2....0..1..0..0....0..1..0..0
..2..3..3..0....1..3..3..4....1..0..1..0....0..0..1..0....0..0..2..2
..4..4..0..0....2..0..0..1....3..3..1..3....0..2..2..0....0..3..3..1
..0..0..2..0....4..1..1..0....2..2..1..1....0..1..0..0....0..1..0..0

Crossrefs

Sequence in context: A177871 A334382 A337098 * A309315 A275339 A049058

Adjacent sequences: A252950 A252951 A252952 * A252954 A252955 A252956

Keyword

nonn

Author

R. H. Hardin, Dec 25 2014

Status

approved