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A146923
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 6, 12, 19, 29, 56, 159, 456, 1350, 3940, 11848, 42451, 167584, 713562, 3187201
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A051936 A365702 A215342 * A349791 A256977 A087883
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved