A147163 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 565, 1121, 12671, 31849, 581567

Offset

1,7

Links

Table of n, a(n) for n=1..13.

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
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A146840 A146587 A147256 * A147179 A146627 A146635

Adjacent sequences: A147160 A147161 A147162 * A147164 A147165 A147166

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved