A147065 - 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

A147065

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01010-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 7, 20, 27, 84, 153, 692, 1605, 7549, 19036, 103045, 315223, 2201412, 8341738, 68161042, 299153867, 2851751081, 14915115066

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

OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.0.1.0

.1.1.0.1.1.1.1.1

.0.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.0

.1.1.1.1.1.0.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A359733 A090879 A084404 * A049947 A266822 A296624

Adjacent sequences: A147062 A147063 A147064 * A147066 A147067 A147068

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved