A209520 Number of n X n 0..7 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..7 introduced in row major order.

1, 6, 2027, 27323948, 16484968944748, 258381047085271692456

Offset: 1

Author

R. H. Hardin Mar 10 2012

Keywords

• nonn

Comments

Diagonal of A209527

Examples

			Some solutions for n=5
..0..0..0..0..0....0..0..0..0..0....0..0..0..1..0....0..0..0..0..1
..1..2..1..2..1....1..2..1..2..3....1..2..3..0..2....1..2..1..3..3
..2..3..2..0..0....1..3..3..1..2....0..0..2..0..1....2..0..0..0..1
..1..1..1..1..2....4..4..5..1..4....4..1..0..1..2....1..1..2..1..2
..0..2..0..2..0....5..6..6..5..1....1..2..0..2..0....0..2..0..0..0