A147340 - OEIS

A147340

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 57, 57, 341, 341, 3079, 3079, 34841, 34841, 488119, 488119, 8511553

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

OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.0.0.0.0.0.1.0.0

.1.1.1.1.0.0.0.1.1.1.1

.0.1.0.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.0.0.1.0

.1.1.1.1.0.0.0.1.1.1.1

.0.0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A205380 A246035 A358128 * A147499 A146591 A146868

Adjacent sequences: A147337 A147338 A147339 * A147341 A147342 A147343

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved