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A147123 Number of n X n binary arrays with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 9, 33, 105, 641, 8787, 211111, 4653287, 141740021, 6813049829, 531641820663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.1

.1.1.1.1.0.0.1.0

.1.0.0.0.0.0.1.0

.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.1.0.0.1.1.1.1

.1.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A220165 A036543 A147269 * A147107 A147115 A147261

Adjacent sequences:  A147120 A147121 A147122 * A147124 A147125 A147126

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 21 02:14 EDT 2018. Contains 315247 sequences. (Running on oeis4.)