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A145804
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1/2 the number of islands of ones fitting in an n X n array symmetric about main diagonal 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, 2, 4, 6, 7, 9, 12, 13, 16, 20, 22, 25, 30, 32, 36
(list;
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listen;
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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 14 islands
.0.1.1.0.0.0.1.1
.1.0.0.1.0.1.0.0
.1.0.0.1.0.1.0.1
.0.1.1.0.0.0.0.1
.0.0.0.0.0.1.1.0
.0.1.1.0.1.0.0.1
.1.0.0.0.1.0.0.1
.1.0.1.1.0.1.1.0
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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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