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A147129
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 7, 25, 45, 79, 171, 569, 1763, 6023, 22593, 106741, 481403, 2734225, 13695379, 86954465
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.1.1.1.1
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.1.1.1.1.0.0.0.1
CROSSREFS
Sequence in context: A119617 A102027 A031294 * A173825 A269589 A278874
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved