proposition: Lemma stirS n m : 'St(n.+1, m.+1) = (m.+1) * 'St(n, m.+1) + 'St(n, m).
proof: Proof. by []. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq path div) mathcomp(fintype tuple finfun bigop finset binomial)