A147073 - 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

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

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

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