A146736 - 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

A146736

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 19, 45, 71, 181, 579, 2359, 9473, 49633, 219719, 1381673, 7390193, 56382323, 390282737, 3729442205, 31973256841

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

OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.0.1.1.1.0.0

.1.1.1.0.0.1.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.1.0.0.1.1.1

.0.0.1.1.1.0.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146616 A146395 A154302 * A176358 A045458 A120289

Adjacent sequences: A146733 A146734 A146735 * A146737 A146738 A146739

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved