A252711 Number of (n+2)X(n+2) 0..3 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

39, 46, 62, 97, 147, 262, 373, 586, 1012, 1422, 2208, 3820, 5248, 8236, 14216, 19372, 30744, 53228, 72248, 116140, 201800, 273772, 444936, 775948, 1053448, 1726732

Offset

1,1

Comments

Diagonal of A252719

Links

Table of n, a(n) for n=1..26.

Example

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

Crossrefs

Sequence in context: A236673 A119028 A252712 * A046512 A143746 A064399

Adjacent sequences: A252708 A252709 A252710 * A252712 A252713 A252714

Keyword

nonn

Author

R. H. Hardin, Dec 20 2014

Status

approved