A147192 - OEIS

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A147192

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 39, 213, 729, 5371, 22321, 227621, 1304481, 19507517, 156958957

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.1.0.1.1.0.0.0

.1.1.0.0.0.0.0.1

.1.0.0.0.0.0.1.1

.0.0.0.1.1.0.1.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A273827 A024825 A147074 * A259665 A284285 A025624

Adjacent sequences: A147189 A147190 A147191 * A147193 A147194 A147195

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved