# Wedderburn–Etherington number

> sequence of numbers counting certain kinds of binary trees

**Wikidata**: [Q2068748](https://www.wikidata.org/wiki/Q2068748)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Wedderburn–Etherington_number)  
**Source**: https://4ort.xyz/entity/wedderburn-etherington-number


## References

1. Freebase Data Dumps. 2013