A147469 - OEIS

A147469

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 155, 155, 1391, 1391, 19355, 19355, 265987, 265987, 4290113, 4290113, 107056079, 107056079

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A147167 A146647 A146719 * A146274 A147037 A146796

Adjacent sequences: A147466 A147467 A147468 * A147470 A147471 A147472

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved