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A147288
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.
0
1, 1, 1, 1, 5, 13, 29, 101, 617, 3357, 20865, 140793, 1290919, 15614005, 229745285, 3898534669
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.0.0.1.1.1.0.0
.1.0.0.0.0.1.0.0
.1.1.1.0.0.1.1.0
.0.0.1.1.0.0.1.0
.0.1.0.0.1.1.0.0
.0.1.1.0.0.1.1.1
.0.0.1.0.0.0.0.1
.0.0.1.1.1.0.0.1
CROSSREFS
Sequence in context: A147278 A268963 A147349 * A146420 A147492 A182069
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved