%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