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A146697
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 5, 17, 57, 245, 1399, 8039, 58749, 512869, 6687103, 97819251, 1920614851, 41357859019
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.0.0.0
.1.1.1.0.0.0.1.1
.1.0.0.0.0.0.1.1
.1.0.0.0.1.1.1.0
.0.1.1.1.0.0.0.1
.1.1.0.0.0.0.0.1
.1.1.0.0.0.1.1.1
.0.0.0.0.0.1.1.0
CROSSREFS
Sequence in context: A098184 A289590 A054113 * A009229 A010914 A180502
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved