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A146672
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 19, 43, 71, 159, 607, 2057, 8951, 43111, 227107, 1266527, 7483327, 50232185, 389882233, 3353662007
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.0.1.1.1.0.0
.1.1.1.0.1.1.0.0
.0.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.0
.0.0.1.1.0.1.1.1
.0.0.1.1.1.0.0.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A336792 A341087 A031393 * A146704 A103145 A100694
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved