A147219 - 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

A147219

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 37, 107, 651, 4763, 31885, 243507, 2726593, 39573223, 647861719, 12294997893, 299566536047, 9265546813073, 344823799726629

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.1.0

.0.0.0.0.1.1.1.0

.0.0.1.1.0.0.1.1

.0.0.0.1.0.0.0.0

.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A121326 A347300 A212876 * A146280 A282511 A147181

Adjacent sequences: A147216 A147217 A147218 * A147220 A147221 A147222

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved