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%I #3 Mar 31 2012 12:35:44
%S 1,10,250,22500,2788800,1002405600,359463283200,326108342112000,
%T 257963213378304000
%N Number of permutations of 3 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap)
%Y Simple 2-way heap A056971
%K nonn
%O 1,2
%A _R. H. Hardin_ May 17 2010
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