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A146064
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
0
1, 1, 1, 1, 1, 1, 49, 91, 755, 1733, 17237, 43939, 2178205, 7075949, 921596877, 3869156215, 535678119399, 2790029976011, 707504525942961, 4543722915142743, 2950922408069540377, 23782316720866894839, 30573780517964151258947
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
CROSSREFS
Sequence in context: A020158 A084632 A020176 * A224905 A224846 A260469
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved