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A146846
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 5, 21, 45, 193, 1001, 5021, 36275, 290647, 2969951, 37399047, 581011371, 11105735741
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.0.0.1.0.0.0.0
.1.1.1.1.0.0.1.1
.0.0.0.1.0.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.0.1.0.0.0
.1.1.0.0.1.1.1.1
.0.0.0.0.1.0.0.1
CROSSREFS
Sequence in context: A265056 A049741 A166010 * A296200 A041825 A022268
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved