1,2
A generator is a leaf or a node with just one child.
Index entries for sequences related to rooted trees
G.f.: (sqrt(4*x^2-8*x+1) - 1)/(2*x-4)
Cf. A108521-A108529, A108525, A000108, A001003.
Sequence in context: A102161 A015655 A047850 this_sequence A006781 A115197 A107593
Adjacent sequences: A108521 A108522 A108523 this_sequence A108525 A108526 A108527
nonn
Christian G. Bower (bowerc(AT)usa.net), Jun 07 2005
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