A147208 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A147208

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 13, 45, 213, 1089, 4693, 30575, 258653, 2683865, 36188311, 599719485

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.1.0.0.1.0.1.0

.1.0.0.0.0.0.1.1

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.1.1.0.0.0.0.0.1

.0.1.0.1.0.0.1.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A254675 A141549 A121964 * A281315 A361622 A010003

Adjacent sequences: A147205 A147206 A147207 * A147209 A147210 A147211

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved