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A145809
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Number of islands of ones fitting in an n X n array with all ones connected only either three adjacent vertically or three adjacent horizontally.
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0
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0, 0, 2, 2, 4, 6, 8, 10, 14, 15, 20, 24
(list;
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refs;
listen;
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text;
internal format)
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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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8 X 8 example with 10 islands
.0.1.1.1.0.1.1.1
.1.0.0.0.0.0.0.0
.1.0.0.0.0.1.1.1
.1.0.1.1.1.0.0.0
.0.0.0.0.0.1.1.1
.1.0.1.1.1.0.0.0
.1.0.0.0.0.1.1.1
.1.0.1.1.1.0.0.0
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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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