Its chambers appear as regions of polynomiality in algebraic geometry, as generalized retarded functions in mathematical physics and as maximal unbalanced families that have applications in economics.
One way to compute the number of chambers of any real arrangement is through the coefficients of its characteristic polynomial which are called Betti numbers.
We show that the Betti numbers of the resonance arrangement are determined by a fixed combination of Stirling numbers of the second kind.
Lastly, we develop exact formulas for the first two non-trivial Betti numbers of the resonance arrangement.

Received: December 1, 2020. Accepted: March 1, 2021. Final version: April 29, 2021.

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