%I A151648
%S A151648 0,100,52800,6021225,447069750,28203920250,1662432014600
%N A151648 Number of permutations of 5 indistinguishable copies of 1..n with exactly 
               3 adjacent element pairs in decreasing order.
%Y A151648 Sequence in context: A027576 A099374 A163663 this_sequence A013747 A065447 
               A036507
%Y A151648 Adjacent sequences: A151645 A151646 A151647 this_sequence A151649 A151650 
               A151651
%K A151648 nonn
%O A151648 1,2
%A A151648 Ron Hardin (rhhardin(AT)att.net) May 29 2009