A147170 - OEIS

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A147170

Number of n X n binary arrays with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

1, 1, 1, 9, 33, 81, 501, 9129, 252307, 4894765, 134053463, 8030367567, 812329207639

(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

.0.1.0.0.1.1.0.0

.0.1.1.1.0.1.0.0

.0.1.0.0.0.1.1.1

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A227221 A273316 A101990 * A146823 A147027 A146256

Adjacent sequences: A147167 A147168 A147169 * A147171 A147172 A147173

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved