Search: id:A007560
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%I A007560 M0325
%S A007560 1,1,1,1,2,2,4,6,10,17,29,51,89,159,284,512,930,1692,3101,
%T A007560 5698,10515,19464,36143,67296,125622,235050,440756,828142,
%U A007560 1558955,2939761,5552744,10504222,19899760,37750091,71704061
%N A007560 Number of planted identity trees where non-root, non-leaf nodes an even 
               distance from root are of degree 2.
%D A007560 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A007560 M. Bernstein and N. J. A. Sloane, <a href="http://arXiv.org/abs/math.CO/
               0205301">Some canonical sequences of integers</a>, Linear Alg. Applications, 
               226-228 (1995), 57-72; erratum 320 (2000), 210.
%H A007560 N. J. A. Sloane, <a href="transforms.txt">Transforms</a>
%H A007560 <a href="Sindx_Ro.html#rooted">Index entries for sequences related to 
               rooted trees</a>
%F A007560 Shifts 2 places left under weigh transform.
%Y A007560 Sequence in context: A000016 A060553 A032307 this_sequence A032237 A124346 
               A033961
%Y A007560 Adjacent sequences: A007557 A007558 A007559 this_sequence A007561 A007562 
               A007563
%K A007560 nonn,nice,eigen
%O A007560 1,5
%A A007560 N. J. A. Sloane (njas(AT)research.att.com).
%E A007560 Better description from Christian G. Bower (bowerc(AT)usa.net), May 15 
               1998.

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