a(n) = Sum_{k = 0..n} 60^k.A269025a(n) = Sum_{k = 0..n} 60^k.Terms a(0) =1a(1) =61a(2) =3661a(3) =219661a(4) =13179661a(5) =790779661a(6) =47446779661External referencesoeis: A269025