a(n) = 13*(100^(n+1) - 1)/99.A156641a(n) = 13*(100^(n+1) - 1)/99.Terms a(0) =13a(1) =1313a(2) =131313a(3) =13131313a(4) =1313131313a(5) =131313131313External referencesoeis: A156641