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Search: id:A137512
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| A137512 |
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The number of nodes visible from underneath a binary tree, where the nodes are placed such that the innermost of the two sprouting nodes should be underneath the mother. |
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+0
1
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| 1, 1, 2, 3, 3, 3, 4, 5, 5, 6, 6, 6, 7, 7, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 13, 13, 14, 14, 15, 15, 16
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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For n=12:
.....0..
.....00.
...0.000
..00000.
we can see nodes 7,8,9,10,11,12 ==> a(12) = 6
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CROSSREFS
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Sequence in context: A049206 A084767 A137580 this_sequence A051134 A037458 A064474
Adjacent sequences: A137509 A137510 A137511 this_sequence A137513 A137514 A137515
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KEYWORD
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nonn
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AUTHOR
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David Reiss (david.reiss(AT)utoronto.ca), May 11 2008
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EXTENSIONS
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I think I managed to destroy the example by editing it. - njas, May 16 2008
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