A147285 - OEIS

A147285

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

1, 1, 1, 1, 3, 7, 15, 31, 117, 707, 4175, 24315, 175637

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OFFSET

1,5

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved