A147186 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 9, 31, 55, 787, 1573, 22701, 53447, 1146545, 3177491, 131825683, 433244499, 34337767649, 134703759045, 16271838583281, 75677568824871, 14799633241575103, 81580228946827257

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A085903 A200180 A147248 * A131623 A032011 A272434

Adjacent sequences: A147183 A147184 A147185 * A147187 A147188 A147189

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved