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.
A217885
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.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =40a(4) =182a(5) =938a(6) =5424a(7) =34788a(8) =244544a(9) =1865144a(10) =15312976a(11) =134495328a(12) =1257334432a(13) =12456693168a(14) =130288665568
External references
- oeis: A217885