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A146624
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 7, 15, 27, 59, 155, 405, 1359, 4729, 17093, 68787, 322325, 1555247, 8826433, 52320689, 346500913, 2442891583, 19699289407, 167408986709, 1625563585505
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.0.1.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.0
.0.0.1.0.1.1.1.1
.0.0.1.0.1.0.0.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A226470 A063611 A292379 * A239934 A193553 A274090
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved