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Search: id:A145801
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| A145801 |
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Number of islands of ones fitting in an n X n array 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, 16, 19, 25, 29, 36
(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 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
.1.0.1.0.1.0.0.0
.1.0.1.0.1.0.1.1
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CROSSREFS
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Sequence in context: A135146 A053096 A155752 this_sequence A033291 A105434 A145196
Adjacent sequences: A145798 A145799 A145800 this_sequence A145802 A145803 A145804
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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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