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A146617
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation.
0
1, 1, 1, 1, 5, 21, 57, 285, 1551, 8309, 69683, 754867, 9884801, 158671845, 3311072917, 81046423259
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.1.1.0.0
.1.1.0.1.1.0.0.0
.1.1.0.1.1.0.0.0
.0.1.1.0.1.0.0.0
.0.0.0.1.0.1.1.0
.0.0.0.1.1.0.1.1
.0.0.0.1.1.0.1.1
.0.0.1.1.0.0.1.0
CROSSREFS
Sequence in context: A033275 A166464 A059859 * A245240 A370839 A203233
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved