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A145813
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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 three adjacent vertically or three adjacent horizontally.
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0
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0, 0, 0, 1, 2, 2, 3, 4, 6, 7, 8, 10, 12, 14, 16, 19, 21, 24, 27, 30
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OFFSET
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1,5
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LINKS
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EXAMPLE
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8 X 8 example with 8 islands
.0.0.0.0.0.0.0.1
.0.0.0.1.1.1.0.1
.0.0.0.0.0.0.0.1
.0.1.0.0.1.1.1.0
.0.1.0.1.0.0.0.1
.0.1.0.1.0.0.0.1
.0.0.0.1.0.0.0.1
.1.1.1.0.1.1.1.0
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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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