a(n) = (2^n + 1)*(2^n + n + 1)^(n-1).A136525a(n) = (2^n + 1)*(2^n + n + 1)^(n-1).Terms a(0) =1a(1) =3a(2) =35a(3) =1296a(4) =157437a(5) =68809488a(6) =117274907815External referencesoeis: A136525