Leonard Smiley, Helmut Prodinger, Robin Chapman, et al.. A Tree-Counting Identity: 10781. The American Mathematical Monthly, 109(3):300-301, 2002. [doi]
@article{SmileyPCa02,
title = {A Tree-Counting Identity: 10781},
author = {Leonard Smiley and Helmut Prodinger and Robin Chapman and et al.},
year = {2002},
url = {http://www.jstor.org/stable/2695370},
researchr = {https://researchr.org/publication/SmileyPCa02},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {109},
number = {3},
pages = {300-301},
}