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A145807
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1/2 the number of islands of ones fitting in an n X n array symmetric under 180 degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally.
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0
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0, 0, 1, 2, 3, 4, 6, 8, 9, 12, 14, 18, 20, 23, 27, 32
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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EXAMPLE
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8 X 8 example with 16 islands
.0.1.0.1.0.1.0.1
.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0
.1.0.1.0.1.0.1.0
.0.1.0.1.0.1.0.1
.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0
.1.0.1.0.1.0.1.0
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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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