Largest palindromic divisor of n!! (double factorial = A006882(n)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =5a(5) =8a(6) =7a(7) =8a(8) =9a(9) =8a(10) =99a(11) =9a(12) =9009a(13) =252a(14) =9009a(15) =252a(16) =9009a(17) =48384a(18) =969969a(19) =48384a(20) =969969a(21) =405504a(22) =969969a(23) =405504a(24) =969969a(25) =405504a(26) =969969a(27) =525525a(28) =969969a(29) =525525