A183823 1/256 the number of (n+1)X5 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

3375, 2377341, 1661285961, 1163575148283, 814479338538099, 570213177028325955, 399185865558804067443, 279459103250217225077847

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 4 of A183827

Examples

			Some solutions with upper left block zero for 3X5
..0..0..2..0..2....0..0..0..0..0....0..0..2..0..0....0..0..0..0..0
..0..0..1..3..0....0..0..2..2..3....0..0..0..2..2....0..0..3..3..2
..0..2..1..2..0....3..0..1..3..3....0..2..2..1..3....2..2..3..3..3