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A146285
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 11, 5, 29, 13, 127, 25, 445, 59, 1927, 333, 10103, 1935, 78527, 9121
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.0.1.0.0.0
.1.1.1.0.0.0.1.1.1
.1.1.0.0.0.0.0.1.1
.1.1.1.0.0.0.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
CROSSREFS
Sequence in context: A133730 A330773 A112031 * A146059 A046531 A289310
KEYWORD
nonn
AUTHOR
STATUS
approved