Number of n element 1..n arrays with each element the minimum of 3 adjacent elements of a permutation of 1..n+2 of n+2 elements.
A217886
Number of n element 1..n arrays with each element the minimum of 3 adjacent elements of a permutation of 1..n+2 of n+2 elements.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =44a(4) =192a(5) =892a(6) =4400a(7) =23086a(8) =129250a(9) =773868a(10) =4953208a(11) =33778104a(12) =244102608a(13) =1858257232a(14) =14822495192
External references
- oeis: A217886