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A146008
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
0
1, 1, 1, 1, 1, 1, 10, 5, 94, 17, 755, 53, 7939, 559, 210819, 10558, 8799077, 208889, 469946628, 6272332, 39105876330, 353563401, 5486841066288, 30617473617, 1188207651549069, 3806002157431, 391224146110279498, 753576262868027
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
CROSSREFS
Sequence in context: A033962 A241360 A096898 * A038307 A094260 A239603
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved