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A146269
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 8, 3, 26, 9, 95, 20, 374, 59, 1990, 238, 12488, 1339, 98678, 8950, 945523, 63227, 10649014, 541368, 148952527
OFFSET
1,7
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.1.1.0.0.0.1.1.0
.1.1.1.0.0.0.1.1.1
.0.1.1.0.0.0.1.1.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A115120 A147373 A147441 * A146679 A146221 A147457
KEYWORD
nonn
AUTHOR
STATUS
approved