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%I #3 Mar 31 2012 12:35:45
%S 0,420,7840,100800,1310400,17255700,222453000,2843961120,36456468048
%N Number of permutations of 1..n with the sequence of sums of 3 adjacent elements having exactly 3 maxima
%K nonn
%O 6,2
%A _R. H. Hardin_ Jul 25 2010