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A147443
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-1010 pattern in any orientation.
0
1, 1, 1, 1, 1, 13, 23, 73, 316, 1171, 5078, 33627, 212172, 2092051, 17868818, 243014937, 3050949895, 53472938233
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.1.0.1.0.0.1.0
.1.1.1.1.0.1.1.1
.0.1.0.1.0.0.1.0
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.0.1.0.0.1.0.1.0
.1.1.1.0.1.1.1.1
.0.1.0.0.1.0.1.0
CROSSREFS
Sequence in context: A316119 A046862 A155093 * A131447 A110196 A039448
KEYWORD
nonn
AUTHOR
STATUS
approved