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Search: id:A007560
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| A007560 |
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Number of planted identity trees where non-root, non-leaf nodes an even distance from root are of degree 2.
(Formerly M0325)
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+0
1
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| 1, 1, 1, 1, 2, 2, 4, 6, 10, 17, 29, 51, 89, 159, 284, 512, 930, 1692, 3101, 5698, 10515, 19464, 36143, 67296, 125622, 235050, 440756, 828142, 1558955, 2939761, 5552744, 10504222, 19899760, 37750091, 71704061
(list; graph; listen)
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OFFSET
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1,5
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210.
N. J. A. Sloane, Transforms
Index entries for sequences related to rooted trees
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FORMULA
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Shifts 2 places left under weigh transform.
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CROSSREFS
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Sequence in context: A000016 A060553 A032307 this_sequence A032237 A124346 A033961
Adjacent sequences: A007557 A007558 A007559 this_sequence A007561 A007562 A007563
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KEYWORD
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nonn,nice,eigen
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Better description from Christian G. Bower (bowerc(AT)usa.net), May 15 1998.
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