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A147268
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 9, 29, 103, 511, 2699, 17395, 132609, 1255857, 18252625, 280167863, 5590707453
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.1.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.1
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A045862 A035075 A103535 * A147376 A201447 A288744
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved