A147074 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 39, 151, 463, 2967, 12351, 101811, 497317, 5967627, 41101207, 709472803

Offset

1,5

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.1.1.0.1.0.0.0.0
.0.1.0.1.1.1.1.1
.0.1.0.0.0.0.0.1
.0.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.0
.1.0.0.0.0.0.1.0
.1.1.1.1.1.0.1.0
.0.0.0.0.1.0.1.1

Crossrefs

Sequence in context: A354775 A273827 A024825 * A147192 A259665 A284285

Adjacent sequences: A147071 A147072 A147073 * A147075 A147076 A147077

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved