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Number of n element 1..n arrays with each element the minimum of 2 adjacent elements of a permutation of 1..n+1 of n+1 elements
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%I #4 Oct 14 2012 08:30:47

%S 1,3,10,40,182,938,5424,34788,244544,1865144,15312976,134495328,

%T 1257334432,12456693168,130288665568,1433829681568

%N Number of n element 1..n arrays with each element the minimum of 2 adjacent elements of a permutation of 1..n+1 of n+1 elements

%C Column 2 of A217891

%e Some solutions for n=4

%e ..2....3....3....1....4....1....1....1....1....1....2....2....1....2....4....3

%e ..1....4....2....2....1....3....2....1....1....3....3....1....1....4....3....3

%e ..1....2....2....2....1....4....3....4....3....2....3....1....3....1....1....2

%e ..4....1....1....4....2....2....4....2....4....2....1....3....3....1....1....1

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 14 2012