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 A119944 #7 Mar 04 2018 20:40:21 %S A119944 0,1,4,6,48,0,360,420,1680,0,25200,0,332640,0,0,360360,11531520,0, %T A119944 220540320,0,0,0,5121436320,0,21416915520,0,53542288800,0, %U A119944 2248776129600,0,69872686884000,72201776446800,0,0,0 %N A119944 First differences of A003418(n) = lcm(1..n). %C A119944 a(n)=0 iff n=0 or n = n(k) = A080765(k), k >= 1. %F A119944 a(n) = A003418(n+1) - A003418(n), n >= 0. A003418(0):=1. %t A119944 Differences[FoldList[LCM,1,Range[40]]] (* _Harvey P. Dale_, Jan 09 2016 *) %K A119944 nonn,easy %O A119944 0,3 %A A119944 _Wolfdieter Lang_, Jul 20 2006