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A147477
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1100 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 9, 19, 52, 181, 742, 4149, 26078, 174469, 1396213, 13529455
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.0.0.1.1.1.1
.0.0.0.1.0.0.1.1
.0.0.0.1.0.0.0.0
.0.0.1.1.1.0.0.0
.0.0.1.1.1.0.0.0
CROSSREFS
Sequence in context: A279682 A102001 A146901 * A146677 A077442 A147455
KEYWORD
nonn
AUTHOR
STATUS
approved