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A147177
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 25, 93, 439, 1973, 9767, 71707, 630927, 7316817, 94092203, 1666775933
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0
.0.0.1.1.0.0.1.1
.1.1.0.0.1.1.0.0
.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A224148 A265929 A297452 * A057255 A134140 A225011
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved