A146705 - 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

A146705

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 21, 47, 269, 1463, 8149, 63091, 761263, 8894963, 159626291, 3010312887, 80637272407

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.0.0.0.1.1.1.1.0

.1.1.0.0.1.0.0.0

.1.1.1.1.0.1.0.0

.0.0.1.0.1.1.1.1

.0.0.0.1.0.0.1.1

.0.1.1.1.1.0.0.0

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A250777 A327302 A156966 * A146713 A140681 A262423

Adjacent sequences: A146702 A146703 A146704 * A146706 A146707 A146708

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved