a(n) = Sinh[(2n-1) ArcSinh[n]].A173133a(n) = Sinh[(2n-1) ArcSinh[n]].Terms a(0) =0a(1) =1a(2) =38a(3) =4443a(4) =1166876a(5) =546365045a(6) =400680904674External referencesoeis: A173133