A147116 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 191, 363, 3347, 7833, 101483, 265285, 7333831, 22771931, 2267436695, 8799931143, 1441598445105, 6843541309397, 1348318402451271

Offset

1,9

Links

Table of n, a(n) for n=1..21.

Example

Maximal 9 X 9 example
.0.1.1.1.0.1.1.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.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
.0.1.0.0.0.0.0.1.0

Crossrefs

Sequence in context: A142086 A070831 A147108 * A142677 A142562 A142619

Adjacent sequences: A147113 A147114 A147115 * A147117 A147118 A147119

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved