%I #23 May 08 2020 22:55:33
%S 1,2,18,396,104940,10808820,160327227060,486432806900040,
%T 72152091814676033160,105952244289903723626034120,
%U 1697305261921685687642685992397720,108004858262683508632706244802225075247640,266448824855803491635798907952730108331437779905720
%N a(n) = lcm{!2, !3, ..., !n}, where !n = A000166(n) is subfactorial.
%C a(n) <= A131631(n).
%H Alois P. Heinz, <a href="/A260656/b260656.txt">Table of n, a(n) for n = 2..45</a>
%H <a href="/index/Lc#lcm">Index entries for sequences related to lcm's</a>
%e For n = 5, a(5) = lcm(!2, !3, !4, !5) = lcm(1, 2, 9, 44) = 396.
%p b:= proc(n) option remember;
%p `if`(n=0, 1, n*b(n-1)+(-1)^n)
%p end:
%p a:= n-> ilcm(seq(b(i), i=2..n)):
%p seq(a(n), n=2..15); # _Alois P. Heinz_, May 08 2020
%t LCM@@@Subfactorial@Range[2, Range[2, 14]]
%o (PARI) a(n) = lcm(vector(n-1, k, if(k+1,round((k+1)!/exp(1)),1))); \\ _Altug Alkan_, Nov 13 2015
%Y Cf. A000166, A131631.
%K nonn
%O 2,2
%A _Vladimir Reshetnikov_, Nov 13 2015