Largest palindromic substring in n! without an initial zero.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =4a(5) =2a(6) =7a(7) =5a(8) =4a(9) =88a(10) =88a(11) =99a(12) =9a(13) =22a(14) =87178a(15) =767a(16) =898a(17) =55a(18) =737a(19) =121a(20) =66a(21) =909a(22) =7777a(23) =25852a(24) =484a(25) =1551a(26) =66a(27) =8888a(28) =888a(29) =93739