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 A380318 #8 May 03 2025 17:20:39
%S A380318 1,1,4,32,288,4608,115200,3110400,99532800,3583180800,175575859200,
%T A380318 11236854988800,910185254092800,91018525409280000,
%U A380318 11013241574522880000,1376655196815360000000,176211865192366080000000,25374508587700715520000000,4288291951321420922880000000,840505222458998500884480000000,181549128051143676191047680000000
%N A380318 Product of the first n perfect powers (A001597).
%H A380318 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PerfectPower.html">Perfect Power</a>.
%t A380318 Join[{1},FoldList[Times,Join[{1},Select[Range[250],GCD@@FactorInteger[#][[All,2]]>1&]]]] (* _Harvey P. Dale_, May 03 2025 *)
%Y A380318 Cf. A000442, A001044, A001597, A002110, A024923, A036691, A076408, A111059.
%K A380318 nonn
%O A380318 0,3
%A A380318 _Ilya Gutkovskiy_, Jan 20 2025