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 A139552 #5 Mar 04 2018 17:45:25 %S A139552 1,1,1,1,1,1,2,2,2,6,6,6,12,12,12,60,60,60,60,60,60,420,420,420,840, %T A139552 840,840,2520,2520,2520,2520,2520,2520,27720,27720,27720,27720,27720, %U A139552 27720,360360,360360,360360,360360,360360,360360,360360,360360,360360,720720 %N A139552 a(n) = lcm(1..floor(n/3)). %C A139552 Row products of A139551. %Y A139552 Cf. A139551, A003418. %K A139552 nonn %O A139552 0,7 %A A139552 _Mats Granvik_, Apr 27 2008