A147323 - OEIS

A147323

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 6, 13, 25, 41, 67, 149, 438

(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

.1.0.0.1.1.1.1.1

.1.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.0.1

.1.0.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.1

.1.1.1.1.1.0.0.1

CROSSREFS

Sequence in context: A032287 A199403 A006017 * A047183 A047194 A048039

Adjacent sequences: A147320 A147321 A147322 * A147324 A147325 A147326

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved