A178018 - OEIS

A178018

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

%I #3 Mar 31 2012 12:35:44

%S 1,5,94,4480,332680,44019800,10480204080,3225666791760,

%T 1530272351292180

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

%Y Simple 2-way heap A056971

%K nonn

%O 1,2

%A _R. H. Hardin_ May 17 2010