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 A124675 #9 Sep 27 2019 12:39:49
%S A124675 1,2,6,8,120,12,5040,384,324,80,39916800,144,6227020800,672,90,
%T A124675 10321920,355687428096000,2592,121645100408832000,1600,756,84480,
%U A124675 25852016738884976640000,62208,9000000,1198080,14285134080,18816
%N A124675 a(n) = product of the positive integers k, k<= n, such that the positive integers <= k and coprime to k are also coprime to n.
%e A124675 The positive integers k, k <= 6, where the positive integers <= k and coprime to k are also coprime to 6, are 1,2,6. So a(6) = 1*2*6 = 12.
%t A124675 f[n_] := Select[Range[n], GCD[ #, n] == 1 &];g[n_] := Select[Range[n], Times @@ GCD[f[ # ], n] == 1 &];Times @@@ Table[g[n], {n, 30}] (* Ray Chandler, Dec 24 2006 *)
%Y A124675 Cf. A126260, A124611.
%K A124675 nonn
%O A124675 1,2
%A A124675 _Leroy Quet_, Dec 24 2006
%E A124675 Extended by _Ray Chandler_, Dec 24 2006