# Euler number

> integer sequence defined by the Taylor series expansion of the hyperbolic secant function and also appearing in that of the secant function

**Wikidata**: [Q947015](https://www.wikidata.org/wiki/Q947015)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Euler_numbers)  
**Source**: https://4ort.xyz/entity/euler-number


## References

1. Nuovo soggettario
2. Freebase Data Dumps. 2013
3. Quora