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 A194130 #19 Feb 20 2022 07:50:08
%S A194130 1,2,2,24,120,240,5040,40320,120960,3628800,39916800,159667200,
%T A194130 6227020800,87178291200,435891456000,20922789888000,355687428096000,
%U A194130 2134124568576000,121645100408832000,2432902008176640000,17030314057236480000,1124000727777607680000
%N A194130 a(n) = n!/gcd(n,3).
%p A194130 A194130 := proc(n)
%p A194130 n!/igcd(n,3) ;
%p A194130 end proc:
%p A194130 seq(A194130(n),n=1..30) ;
%t A194130 Table[n!/GCD[n,3],{n,20}] (* _Harvey P. Dale_, Aug 08 2019 *)
%Y A194130 Cf. A109007, A144396, A005563, A051925.
%K A194130 nonn
%O A194130 1,2
%A A194130 _Paul Curtz_, Aug 16 2011
%E A194130 Definition and offset corrected by _R. J. Mathar_, Aug 18 2011