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Search: id:A145802
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| A145802 |
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Number of islands of ones fitting in an n X n array symmetric under horizontal 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, 1, 2, 4, 6, 9, 12, 15, 19, 25, 28, 33, 40, 49, 53, 60, 69, 81, 86, 95
(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 15 islands
.1.0.0.1.1.0.0.1
.1.0.1.0.0.1.0.1
.0.0.1.0.0.1.0.0
.1.1.0.1.1.0.1.1
.0.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.0.0.1.1.0.0.1
.0.1.1.0.0.1.1.0
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CROSSREFS
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Sequence in context: A075349 A156024 A130025 this_sequence A076271 A036441 A134678
Adjacent sequences: A145799 A145800 A145801 this_sequence A145803 A145804 A145805
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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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