%I A129647
%S A129647 0,1,2,3,6,5,12,15,20,21,30,35,42,45,56,63,72,77,90,99,110,117,132,143,
%T A129647 156,165,182,195,210,221,240,255,272,285,306,323,342,357,380,399,420,
%U A129647 437,462,483,506,525,552,575,600,621,650,675,702,725,756,783,812,837
%N A129647 Largest order of a permutation of n elements with exactly 2 cycles. Also 
               the largest LCM of a 2-partition of n.
%C A129647 a(n) is asymptotic to (n^2)/4
%e A129647 a(26)=165 because 26=11+15 and LCM(11,15)=165 is maximal.
%t A129647 Max[LCM @@@ Compositions[ #, 2]]& /@ Range[1, n]
%Y A129647 Cf. A000793, A129648, A129649, A129650, A129651.
%Y A129647 Sequence in context: A095113 A002517 A053570 this_sequence A136183 A100211 
               A071257
%Y A129647 Adjacent sequences: A129644 A129645 A129646 this_sequence A129648 A129649 
               A129650
%K A129647 nonn
%O A129647 1,3
%A A129647 Nickolas Reynolds (nickels(AT)gmail.com), Apr 25 2007