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 A189103 #9 Mar 11 2022 12:42:13 %S A189103 0,2,30,264,7320,30960,1592640,38183040,394450560,2238969600, %T A189103 275106585600,4038941491200,689773321036800,20996629900646400, %U A189103 111964387062528000,2210304446558208000,642338416210563072000,19249748121316737024000,6980209591900198477824000 %N A189103 Least common multiple of n! and its arithmetic derivative. %H A189103 Nathaniel Johnston, <a href="/A189103/b189103.txt">Table of n, a(n) for n = 1..200</a> %F A189103 a(n) = lcm(n!,n!') = lcm(A000142(n),A068311(n)). %e A189103 n = 5: 5! = 120, 120' = 244, lcm(120,244) = 7320 -> a(5) = 7320 %Y A189103 Cf. A068311, A083346, A083346, A085731, A086130, A189100, A189102. %K A189103 nonn %O A189103 1,2 %A A189103 _Giorgio Balzarotti_, Apr 16 2011