A146723 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111 pattern in any orientation.

1, 1, 1, 1, 9, 13, 35, 63, 1723, 4113, 139447, 424285, 17547037, 65696265, 8305366965, 39548747551, 8986486324279, 53849970214263, 23104370746283843, 173734005704827315

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A146864 A287766 A146739 * A146422 A147352 A147391

Adjacent sequences: A146720 A146721 A146722 * A146724 A146725 A146726

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved