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A146476
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.
0
1, 1, 1, 5, 9, 21, 67, 487, 1541, 16797, 92947, 1357947, 11628507, 269865307, 3412847085, 120253566545
OFFSET
1,4
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.0.0.0.0.0.0.0
.0.1.1.1.0.1.1.1
.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
CROSSREFS
Sequence in context: A050559 A082676 A146932 * A110200 A063404 A102177
KEYWORD
nonn
AUTHOR
STATUS
approved