Weston-CountingBinary-Page5-Fig2.png
Quoted document:

Weston, Paul E. (1966): Counting binary, rooted trees. arboreal numbers of the first and second kind. In: Ryan, Hollis F.; Weston, Paul E. (Hg.): Rooted trees. BCL Report No. 2.0. Urbana Ill., p. 1–26., p. 5.



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