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A146070
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 5, 1, 9, 25, 101, 401, 3215, 13761, 224503, 1483715, 30996399, 381934429, 12283193557, 226607791453, 11864500856825
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.1.1.0.0.0.1.0
.0.1.0.0.1.1.1.0
.1.1.0.0.1.0.0.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.0.0.1.0.0.1.1
.0.1.1.1.0.0.1.0
.0.1.0.0.0.1.1.0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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