a(n) = 90*a(n-1) + 1.A172174a(n) = 90*a(n-1) + 1.Terms a(0) =1a(1) =91a(2) =8191a(3) =737191a(4) =66347191a(5) =5971247191a(6) =537412247191External referencesoeis: A172174