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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.
0
1, 1, 1, 1, 3, 7, 15, 31, 117, 707, 4175, 24315, 175637
OFFSET
1,5
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
.1.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A146598 A147094 A326518 * A147250 A336701 A066175
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved