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Search: id:A145807
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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
1
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| 0, 0, 1, 2, 3, 4, 6, 8, 9, 12, 14, 18, 20, 23, 27, 32
(list; graph; listen)
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OFFSET
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1,4
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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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Sequence in context: A113961 A116621 A036407 this_sequence A122380 A033501 A097273
Adjacent sequences: A145804 A145805 A145806 this_sequence A145808 A145809 A145810
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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 19 2008
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