login
A147512
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.
0
1, 1, 1, 1, 5, 9, 25, 59, 279, 1153, 8111, 46003, 371173, 2930355, 33533835, 383283501
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.1.1.1.0.0.0.1
.0.1.1.1.1.0.1.1
.0.0.0.0.0.0.1.1
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.0
.1.1.0.0.0.0.0.0
.1.1.0.1.1.1.1.0
.1.0.0.0.1.1.1.1
CROSSREFS
Sequence in context: A147286 A137199 A221567 * A301960 A050359 A062812
KEYWORD
nonn
AUTHOR
STATUS
approved