Signed Stirling Number of the First Kind of 1

Theorem

 * $s \left({1, n}\right) = \delta_{1 n}$

where:
 * $s \left({1, n}\right)$ denotes a signed Stirling number of the first kind
 * $\delta_{1 n}$ is the Kronecker delta.

Also see

 * Unsigned Stirling Number of the First Kind of 1
 * Stirling Number of the Second Kind of 1