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 A186944 #23 Jul 20 2025 14:59:07
%S A186944 1,2,2,6,6,30,30,210,210,210,210,2310,2310,30030,30030,30030,30030,
%T A186944 510510,510510,9699690,9699690,9699690,9699690,223092870,223092870,
%U A186944 223092870,223092870,223092870,223092870,6469693230,6469693230,200560490130,200560490130
%N A186944 Geometric mean of n-th row of A080508.
%F A186944 For n != 2, a(n) = A034386(n-1). - _Jeppe Stig Nielsen_, Nov 04 2018
%o A186944 (PARI) a(n) = {if (n == 1, return (1)); if (n == 2, return (2)); f = factor((n-1)!); prod(i=1, #f~, f[i,1]);} \\ _Michel Marcus_, Aug 30 2013
%o A186944 (PARI) a(n) = if(n==2, 2, prod(i=1,primepi(n-1),prime(i))) \\ _Jeppe Stig Nielsen_, Nov 04 2018
%Y A186944 Cf. A080509, A083907, A034386.
%K A186944 nonn
%O A186944 1,2
%A A186944 _Michel Marcus_, Aug 30 2013