A177644 - OEIS

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A177644

Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up

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

%S 1,70,29874,43724128,163394718481,1305717814847931,

%T 19780733910930967382

%N Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up

%K nonn

%O 1,2

%A _R. H. Hardin_ May 10 2010