A147495 - 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

A147495

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11101-10111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 15, 25, 49, 107, 263, 719, 2181

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

OFFSET

1,8

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.1.0.1.1.1.0.1.1

.1.1.1.0.1.0.1.0

.0.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.0

.0.1.0.1.0.1.1.1

.1.1.0.1.1.1.0.1

CROSSREFS

Sequence in context: A353613 A229312 A197072 * A147426 A100437 A339567

Adjacent sequences: A147492 A147493 A147494 * A147496 A147497 A147498

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved