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A146830
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 25, 97, 477, 2077, 8985, 74677, 698825, 7828097, 101646585, 1842811427
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.1.0.0
.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1
.1.0.0.0.1.1.0.0
.0.0.1.1.0.0.0.1
.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0
.0.0.1.0.0.0.1.0
CROSSREFS
Sequence in context: A197085 A273747 A201841 * A316778 A255612 A022729
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved