A147076 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 10000-11111-10000 pattern in any orientation.

1, 1, 1, 1, 3, 1, 19, 9, 139, 27, 2920, 1117, 150482, 41401, 10982835, 1602485, 1208797417, 157953713, 292923653699, 29971826239, 128550895495446, 9240996121217

Offset

1,5

Links

Table of n, a(n) for n=1..22.

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
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A227888 A188109 A247232 * A027537 A192721 A370949

Adjacent sequences: A147073 A147074 A147075 * A147077 A147078 A147079

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved