A147236 - 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

A147236

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 19, 19, 49, 49, 195, 195, 1111, 1111

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

OFFSET

1,11

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.1.0.0.0.1.0.0.0

.1.0.0.1.1.0.1.1.0.0.1

.1.1.1.0.1.0.1.0.1.1.1

.1.0.1.1.0.0.0.1.1.0.1

.0.0.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.0.0.1.1.0.1

.1.1.1.0.1.0.1.0.1.1.1

.1.0.0.1.1.0.1.1.0.0.1

.0.0.0.1.0.0.0.1.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

CROSSREFS

Sequence in context: A146687 A146655 A146812 * A146599 A107222 A050613

Adjacent sequences: A147233 A147234 A147235 * A147237 A147238 A147239

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved