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Search: id:A145803
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| A145803 |
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1/2 the number of islands of ones fitting in an n X n array symmetric under horizontal and vertical reflection 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, 0, 2, 3, 4, 6, 7, 9, 12, 14, 16, 20, 23, 25, 30, 34, 38, 42, 46, 53, 58
(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 14 islands
.1.1.0.1.1.0.1.1
.0.0.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.1.1.0.1.1.0.1.1
.0.0.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
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CROSSREFS
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Sequence in context: A049149 A156287 A162293 this_sequence A018629 A018357 A061489
Adjacent sequences: A145800 A145801 A145802 this_sequence A145804 A145805 A145806
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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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