Number of permutations of {1..n} with fewer than 5 interior elements having values lying between the values of their neighbors.
A226438
Number of permutations of {1..n} with fewer than 5 interior elements having values lying between the values of their neighbors.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5038a(8) =40066a(9) =353556a(10) =3399246a(11) =35142546a(12) =387129588a(13) =4515261680a(14) =55502974820a(15) =716557285110
External references
- oeis: A226438