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%I #6 Aug 28 2021 11:38:00
%S 0,1,3,15,21,183,309,1347,4041,17163,31329,149427,171081,1233963,
%T 4422609,13628187,30794481,116887923,154627929,929468907,3253991841,
%U 10227560643,26026830729,88788949947,255658392081,820517465043,2461552395129,7545284051787,20547702892161
%N a(n) = 3^(n-1) - lcm{1..n}.
%Y Cf. A003418, A347302.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Aug 28 2021