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 A064493 #11 Jul 14 2023 01:45:13
%S A064493 1,2,4,20,260,9620,4454060
%N A064493 List of distinct greatest common divisors of { k! and k! - (k-1)! + (k-2)! - ... + (-1)^k*0!, k = 0 .. n}.
%C A064493 Records in the sequence gcd(k!,A058006(k)). The record indices are products of primes from A064384. There are no further terms unless there are terms in A064384 larger than 463. - _Max Alekseyev_, Jul 06 2010
%Y A064493 Cf. A000142, A058006, A064383, A064384, A005165.
%K A064493 hard,more,nonn
%O A064493 0,2
%A A064493 _Vladeta Jovovic_, Oct 04 2001