a(n) = a(n-1)*2^n-1 with a(1)=1.A073588a(n) = a(n-1)*2^n-1 with a(1)=1.Terms a(0) =1a(1) =3a(2) =23a(3) =367a(4) =11743a(5) =751551a(6) =96198527a(7) =24626822911External referencesoeis: A073588