A147141 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 89, 89, 531, 531, 4899, 4899, 96559, 96559, 2300395, 2300395, 69316227, 69316227, 2985544439, 2985544439

Offset

1,9

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A146032 A147093 A147101 * A146146 A145937 A246983

Adjacent sequences: A147138 A147139 A147140 * A147142 A147143 A147144

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved