A147270 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 183, 351, 3185, 7397, 80251, 204181, 3751343, 10958987, 859595115, 3088432553, 597934255811, 2680671785861

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.1.1.1.1.0.1.1.1.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0

Crossrefs

Sequence in context: A133609 A305349 A030465 * A147124 A261110 A260172

Adjacent sequences: A147267 A147268 A147269 * A147271 A147272 A147273

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved