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A147246
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.
0
1, 1, 1, 1, 5, 21, 67, 345, 1649, 10337, 85161, 930265, 12022615, 198707417, 3901444367
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.0.1.1.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.1.1.1
.0.0.0.0.1.1.0.1
CROSSREFS
Sequence in context: A272987 A272310 A273740 * A335982 A271282 A203287
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved