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Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, down, up, up, up
0

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

%S 1,6,90,2512,112440,7367330,664573798,78969593280,11955422386863,

%T 2246458143581603

%N Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, down, up, up, up

%K nonn

%O 1,2

%A _R. H. Hardin_ May 10 2010