This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A114340 #6 Oct 13 2022 05:55:58 %S A114340 1,2,3,8,5,8,7,8,9,8,99,9,9009,252,9009,252,9009,48384,969969,48384, %T A114340 969969,405504,969969,405504,969969,405504,969969,525525,969969, %U A114340 525525,79833897,525525,133464331,595595,5273993725,595595 %N A114340 Largest palindromic divisor of n!! (double factorial = A006882(n)). %F A114340 a(n) = A093030(A006882(n)). - _Michel Marcus_, Oct 13 2022 %e A114340 a(16)=252 since 252 is the largest palindromic factor of 16!!= 10321920=252* 40960. %t A114340 palQ[n_]:= n == FromDigits@Reverse@IntegerDigits@n; Array[Max[Select[Divisors[ #!! ], palQ]] &, 40] %Y A114340 Cf. A006882, A093030, A093888. %K A114340 base,nonn %O A114340 1,2 %A A114340 _Giovanni Resta_, Feb 07 2006