A183815 - OEIS

A183815

1/81 the number of (n+1) X 5 0..2 arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

512, 65640, 8231592, 1042063656, 131467169720, 16607782066704, 2096961683069192, 264820293988996048, 33441129238755694072, 4223013161022170839808, 533285078101618075961512

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A183819.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions with upper left block zero for 3 X 5

..0..0..2..0..2....0..0..1..1..2....0..0..1..2..0....0..0..2..2..2

..0..0..2..2..1....0..0..2..1..2....0..0..1..2..1....0..0..2..1..1

..0..1..1..2..0....0..2..0..0..1....2..1..1..1..2....0..1..1..0..0