Add Stirling number of the first kind to the user guide
@@ -295,7 +295,10 @@ list.forEach(c -> System.out.println(Arrays.toString(c)));
[3, 4, 5]
+------------------------------------------+
- The <<<Stirling>>> class can evaluate Stirling numbers of the second kind \( S(n, k) \). This is
+ The <<<Stirling>>> class can evaluate Stirling numbers of the first kind and second kind.
+ The Stirling numbers of the first kind \( s(n, k) \) arise in the study of permutations,
+ particularly counting the permutations of a set according to their number of cycles.
+ The Stirling number of the second kind \( S(n, k) \) is
the number of ways of partitioning a set of \( n \) elements into \( k \) non-empty subsets.
For example a set of 3 elements may be partitioned into:
