%I #7 Feb 22 2015 11:41:46
%S 1,1,2,2,3,3,6,10,10,10,13,14,14,15,18,18,18,18,18,18,20,20,20,20,20,
%T 20,21,21,21,22,22,22,24,24,24,24,24
%N a(n) = (A048891(n)-1)/A023143(n).
%Y Cf. A023143, A048891.
%K nonn,more
%O 1,3
%A _Zak Seidov_, Feb 19 2015