A147259 - OEIS

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A147259

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0001-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 43, 61, 149, 365, 1499

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.0.1.1.0.1.0.0

.1.1.1.0.0.1.1.0

.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0

.0.1.1.0.0.1.1.1

.0.0.1.0.1.1.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A298234 A129789 A093576 * A328740 A183315 A183184

Adjacent sequences: A147256 A147257 A147258 * A147260 A147261 A147262

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved