Total number of digits in palindromes with n digits.

Terms

a(0) =10a(1) =18a(2) =270a(3) =360a(4) =4500a(5) =5400a(6) =63000a(7) =72000a(8) =810000a(9) =900000a(10) =9900000a(11) =10800000a(12) =117000000a(13) =126000000a(14) =1350000000a(15) =1440000000a(16) =15300000000a(17) =16200000000a(18) =171000000000a(19) =180000000000