proposition: Lemma stir_n1 n: 'St(n.+1, 1) = 1.
proof: Proof. by elim: n => // n Ihn; rewrite stirS Ihn. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq path div) mathcomp(fintype tuple finfun bigop finset binomial)