Largest palindromic substring in 9^n.

Terms

a(0) =1a(1) =9a(2) =8a(3) =9a(4) =656a(5) =9a(6) =1441a(7) =969a(8) =7a(9) =9a(10) =44a(11) =313a(12) =282a(13) =828a(14) =767a(15) =94649a(16) =888a(17) =6996a(18) =999a(19) =2992a(20) =545a(21) =989a(22) =232a(23) =959a(24) =6336a(25) =7897987a(26) =989a(27) =969a(28) =5115a(29) =101