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Search: id:A145817
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| A145817 |
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Number of islands of ones fitting in an n X n array symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally. |
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+0
1
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| 0, 0, 2, 2, 4, 6, 8, 10, 14, 14, 19, 24, 26, 30, 38
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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8 X 8 example with 10 islands
.1.0.1.1.1.0.0.0
.1.0.0.0.0.1.1.1
.1.0.1.1.1.0.0.0
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.0.0.0.1.1.1.0.1
.1.1.1.0.0.0.0.1
.0.0.0.1.1.1.0.1
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CROSSREFS
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Sequence in context: A147570 A049625 A118303 this_sequence A145809 A116859 A147982
Adjacent sequences: A145814 A145815 A145816 this_sequence A145818 A145819 A145820
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Oct 20 2008
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