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A147359
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-0110-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 23, 84, 333, 1104, 4907, 30924, 222811, 1874271, 20520483
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.0.0.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A283114 A290938 A193696 * A034447 A255803 A121329
KEYWORD
nonn
AUTHOR
STATUS
approved