A147014 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 31, 111, 377, 1545, 10231, 72633, 559663, 5155711, 55582209, 698619471, 11001973207, 206072905483, 4521907343165, 116328599746355, 3545239477906611, 127491366766265465

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.1.0
.0.1.0.0.0.1.0.0
.1.1.1.1.1.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A121129 A051402 A147022 * A146376 A146368 A147424

Adjacent sequences: A147011 A147012 A147013 * A147015 A147016 A147017

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved