A147248 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 9, 31, 55, 549, 1047, 10041, 21681, 484881, 1255593, 40179283, 122480813, 7136007271, 25526356825, 2044413653787, 8531086609057, 1153670123416227, 5640169181500505, 1230123398597079731

Offset

1,7

Links

Table of n, a(n) for n=1..25.

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
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A186234 A085903 A200180 * A147186 A131623 A032011

Adjacent sequences: A147245 A147246 A147247 * A147249 A147250 A147251

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved