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A147216
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
0
1, 1, 1, 1, 5, 21, 61, 299, 1693, 11273, 84165, 889613, 11762051, 208288599, 4127254537, 109970171123
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.1.1.1.0.1
.0.0.0.1.1.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.1.1.0.0.0
.1.0.1.1.1.0.0.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A147375 A351934 A356328 * A362573 A196631 A357723
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved