login
A147375
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 21, 61, 266, 891, 3074, 18035, 122510, 915879, 8736750, 97430523, 1219777035, 17287269221
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.0.0.1.0
.0.0.1.1.0.1.1.1
.1.1.1.0.0.1.0.1
.0.0.0.0.0.1.0.1
.1.0.1.0.0.0.0.0
.1.0.1.0.0.1.1.1
.1.1.1.0.1.1.0.0
.0.1.0.0.0.1.1.1
CROSSREFS
Sequence in context: A287617 A354551 A143567 * A351934 A356328 A147216
KEYWORD
nonn
AUTHOR
STATUS
approved