A253036 Number of (n+2)X(n+2) 0..3 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order

130, 540, 1750, 5860, 25601, 115438, 620736, 3167807, 17606301, 98882069, 733424153, 4422336009

Offset

1,1

Comments

Diagonal of A253044

Links

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

Example

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

Crossrefs

Sequence in context: A253044 A253037 A281209 * A187723 A278658 A254924

Adjacent sequences: A253033 A253034 A253035 * A253037 A253038 A253039

Keyword

nonn

Author

R. H. Hardin, Dec 26 2014

Status

approved