n times n+5 gives the concatenation of two numbers m and m-6.

Terms

a(0) =8a(1) =9a(2) =98a(3) =99a(4) =361a(5) =635a(6) =712a(7) =921a(8) =998a(9) =999a(10) =8903a(11) =9998a(12) =9999a(13) =81816a(14) =99998a(15) =99999a(16) =336631a(17) =663365a(18) =999998a(19) =999999a(20) =7272725a(21) =9999998a(22) =9999999a(23) =76470587a(24) =99999998a(25) =99999999a(26) =333666331a(27) =405436666a(28) =428571427a(29) =447710183