%I

%S 1,16,1520,495180,433646850,611015783700,1736467679089500,

%T 9462444875350395600

%N Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/4)] (4-way heap)

%Y Simple 2-way heap A056971

%K nonn

%O 1,2

%A _R. H. Hardin_ May 17 2010