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Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down, up.
0

%I #5 Jan 25 2016 15:54:08

%S 1,1,20,1680,359582,156245130,120386806922,150097348110878,

%T 283411248751268531

%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down, up.

%Y Cf. A014606.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 10 2010