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A146712
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 21, 41, 81, 159, 629, 2101
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.0.1.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.1.0.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A178082 A056387 A056377 * A364051 A318549 A217000
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved