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A146696
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 15, 39, 69, 161, 595, 1935, 6509, 28979, 154855, 881531, 5028621, 31192755, 226496585, 1775509113
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.1.1.1
.1.0.0.0.1.1.0.0
.1.1.1.0.1.1.0.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.0.1.1.0.1.1.1
.0.0.1.1.0.0.0.1
.1.1.1.0.0.0.0.1
CROSSREFS
Sequence in context: A121051 A139042 A020142 * A186295 A259429 A126950
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved