A147156 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 211, 393, 3687, 9027, 129263

Offset

1,9

Links

Table of n, a(n) for n=1..13.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A142901 A142168 A142288 * A140535 A258332 A073102

Adjacent sequences: A147153 A147154 A147155 * A147157 A147158 A147159

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved