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A146230
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 13, 33, 61, 183, 597, 2481, 11129, 55369, 260691, 1725489, 11211005, 97261999, 792491905, 8327148961, 84267555083, 1143224998469
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.1.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.1
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A168375 A032586 A147137 * A166805 A252979 A332366
KEYWORD
nonn
AUTHOR
STATUS
approved