A183809 1/16 the number of (n+1)X8 binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

729, 18567, 418925, 10494847, 249227639, 6153770375, 148654946039, 3645190453457, 88602958444787, 2166253373649057, 52777731056211077, 1288799761305039781, 31427943533967865959, 767074334899635021939

Offset

1,1

Comments

Column 7 of A183811

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Example

Some solutions with upper left block zero for 3X8
..0..0..0..0..0..1..1..0....0..0..1..1..0..0..0..0....0..0..0..1..0..0..0..1
..0..0..1..1..0..1..0..1....0..0..1..0..1..0..0..1....0..0..1..0..0..0..1..1
..1..1..1..1..0..0..1..1....1..1..1..0..0..1..1..1....1..0..1..1..1..0..1..0

Crossrefs

Sequence in context: A017631 A209508 A016758 * A224004 A232028 A203651

Adjacent sequences: A183806 A183807 A183808 * A183810 A183811 A183812

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved