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 A179214 #3 Mar 30 2012 18:51:06 %S A179214 2,6,90,210,2100,4620,140140,300300,5105100,96996900,4481256780, %T A179214 9369900540,243617414040,18739801080,1164544781400,2406725881560, %U A179214 2700346439110320,5559536786403600,7816708721683461600 %N A179214 Product of squarefree numbers between n and 2*n (inclusive). %C A179214 A073838(n) <= a(n) <= A126804(n); %C A179214 a(n) = A179215(2*n)/A179215(n-1). %F A179214 a(n) = PROD(k^A008966(k): n <= k <= 2*n). %e A179214 a(10) = 10*11*13*14*15*17*19 = 96996900; %e A179214 a(11) = 11*13*14*15*17*19*21*22 = 4481256780; %e A179214 a(12) = 13*14*15*17*19*21*22*23 = 9369900540. %Y A179214 Cf. A179211, A179213, A005117. %K A179214 nonn %O A179214 1,1 %A A179214 _Reinhard Zumkeller_, Jul 05 2010 %E A179214 Example corrected by _Reinhard Zumkeller_, Jul 19 2010