Number of permutations of {1..n} with fewer than 6 interior elements having values lying between the values of their neighbors.
A226439
Number of permutations of {1..n} with fewer than 6 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) =5040a(8) =40318a(9) =362370a(10) =3600306a(11) =38963958a(12) =453658380a(13) =5626972260a(14) =73801171100
External references
- oeis: A226439