%I A151657
%S A151657 0,1225,818300,160310458,22727054364,2892619063243
%N A151657 Number of permutations of 7 indistinguishable copies of 1..n with exactly 
               3 adjacent element pairs in decreasing order.
%Y A151657 Sequence in context: A025407 A025405 A014795 this_sequence A046177 A031748 
               A031623
%Y A151657 Adjacent sequences: A151654 A151655 A151656 this_sequence A151658 A151659 
               A151660
%K A151657 nonn
%O A151657 1,2
%A A151657 Ron Hardin (rhhardin(AT)att.net) May 29 2009