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A147476
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-1100 pattern in any orientation.
0
1, 1, 1, 1, 5, 1, 23, 11, 466, 277, 14218, 3983, 707294, 112981, 56470385, 8891967
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
CROSSREFS
Sequence in context: A259682 A286897 A167572 * A146675 A201884 A294138
KEYWORD
nonn
AUTHOR
STATUS
approved