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 A080506 #2 Dec 05 2013 19:56:00 %S A080506 1,3,6,10,30,12,210,330,210,210,2310,3570,30030,2310,30030,690690, %T A080506 510510,30030,9699690,14804790,9699690,19399380,223092870,9699690, %U A080506 223092870,223092870,223092870,9146807670,6469693230,223092870 %N A080506 Geometric mean of n-th row of A080504. %Y A080506 Cf. A080504, A080505, A081556, A080507. %K A080506 nonn %O A080506 1,2 %A A080506 _Amarnath Murthy_, Mar 20 2003