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

1,1

Comments

Column 4 of A183827

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A251153 A305500 A250568 * A114769 A013803 A013876

Adjacent sequences: A183820 A183821 A183822 * A183824 A183825 A183826

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved