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 A069045 #7 May 01 2024 13:06:11 %S A069045 1,8,216,1728,216000,648000,222264000,1778112000,16003008000, %T A069045 16003008000,21300003648000,21300003648000,46796108014656000, %U A069045 46796108014656000,46796108014656000,374368864117248000 %N A069045 Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i)). %Y A069045 Cf. A007480, A002805. %K A069045 easy,nonn %O A069045 1,2 %A A069045 _Benoit Cloitre_, Apr 03 2002