A252687 Number of (n+2)X(n+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and in every diagonal and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order

46, 142, 134, 1480, 568, 18940, 2592, 255112, 12400, 3480808, 60728, 47653672, 302104, 653003512, 1520088

Offset

1,1

Comments

Diagonal of A252695

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Sequence in context: A074866 A229207 A122513 * A053019 A044378 A044759

Adjacent sequences: A252684 A252685 A252686 * A252688 A252689 A252690

Keyword

nonn

Author

R. H. Hardin, Dec 20 2014

Status

approved