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