A147073 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 11, 21, 39, 89, 219, 569, 1579, 5069, 17101, 62347, 244493, 1058973, 4994427, 25066841, 137507293, 817420471

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.0.1
.0.1.0.1.1.1.1.1
.0.1.0.1.0.0.0.0
.0.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.0
.0.0.0.0.1.0.1.0
.1.1.1.1.1.0.1.0
.1.0.0.0.0.0.1.1

Crossrefs

Sequence in context: A322595 A317298 A064568 * A147191 A327607 A034185

Adjacent sequences: A147070 A147071 A147072 * A147074 A147075 A147076

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved