A178021 - OEIS

A178021

Number of permutations of 3 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap)

%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