proposition: Lemma nth_stern11_alt n i: i <= 2^n -> nth 0 (stern11 n) i = stern (2^n - i) + stern i.
proof: Proof. by move => h; rewrite (sternD_stern) // !mul1n. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype order bigop ssralg) mathcomp(div ssrnum ssrint rat prime path binomial) mathcomp(tuple finset) gaia(fibm)