A147165 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 39, 131, 669, 4577, 33447, 274545

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.1.0.1.1.0
.0.0.0.1.1.0.1.1
.1.1.1.0.1.1.0.1
.1.0.1.1.0.0.1.1
.0.1.0.1.0.0.0.0
.0.1.1.0.1.0.0.0
.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A122734 A250413 A163686 * A147257 A146645 A146717

Adjacent sequences: A147162 A147163 A147164 * A147166 A147167 A147168

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved