A147074 - OEIS

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A147074

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 39, 151, 463, 2967, 12351, 101811, 497317, 5967627, 41101207, 709472803

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.0.0.0.0

.0.1.0.1.1.1.1.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.1.0.0.0.0.0.1.0

.1.1.1.1.1.0.1.0

.0.0.0.0.1.0.1.1

CROSSREFS

Sequence in context: A354775 A273827 A024825 * A147192 A259665 A284285

Adjacent sequences: A147071 A147072 A147073 * A147075 A147076 A147077

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved