login
A146434
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 9, 3, 20, 7, 76, 13, 246, 27, 866, 99, 3607, 409, 20611, 1589, 124905, 6601, 826121, 37581
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.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
.0.1.0.0.0.0.0.1.0
.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
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A262397 A155912 A050354 * A126213 A146935 A360756
KEYWORD
nonn
AUTHOR
STATUS
approved