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A146070
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
0
1, 1, 5, 1, 9, 25, 101, 401, 3215, 13761, 224503, 1483715, 30996399, 381934429, 12283193557, 226607791453, 11864500856825
OFFSET
1,3
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.0.1.0
.0.1.0.0.1.1.1.0
.1.1.0.0.1.0.0.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.0.0.1.0.0.1.1
.0.1.1.1.0.0.1.0
.0.1.0.0.0.1.1.0
CROSSREFS
Sequence in context: A324378 A147404 A254068 * A308504 A040029 A105086
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved