Number of n element 1..n arrays with each element the minimum of 4 adjacent elements of a permutation of 1..n+3 of n+3 elements.
A217887
Number of n element 1..n arrays with each element the minimum of 4 adjacent elements of a permutation of 1..n+3 of n+3 elements.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =45a(4) =196a(5) =898a(6) =4272a(7) =21002a(8) =106564a(9) =558780a(10) =3037926a(11) =17203726a(12) =101981944a(13) =635338608
External references
- oeis: A217887