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A146861
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 19, 37, 77, 131, 515, 1575, 6459, 26455, 139873, 647697, 4036849, 21133021, 162531941, 1088442077
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.1.1.0.0
.0.0.1.1.1.0.0.0
.1.0.0.0.1.0.1.1
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.1.1.0.1.0.0.0.1
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0
CROSSREFS
Sequence in context: A031093 A297750 A285226 * A068963 A257929 A254060
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved