a(n) = 4*11^n+1.A199753a(n) = 4*11^n+1.Terms a(0) =5a(1) =45a(2) =485a(3) =5325a(4) =58565a(5) =644205a(6) =7086245a(7) =77948685a(8) =857435525a(9) =9431790765a(10) =103749698405External referencesoeis: A199753