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A146194
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 13, 33, 61, 131, 505, 1541, 6387, 29305, 198459, 1139657, 7455433, 47764793, 415936701, 3457440839, 39284046163, 428565300485, 6364187322071
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.0.0.1.0.1.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.1.0.1.0.0.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A082109 A024839 A146177 * A204707 A282686 A124659
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved