Number of permutations of {1..n} with fewer than 4 interior elements having values lying between the values of their neighbors.
A226437
Number of permutations of {1..n} with fewer than 4 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) =718a(7) =4914a(8) =37300a(9) =308460a(10) =2748354a(11) =26194542a(12) =265691456a(13) =2856606480a(14) =32449828310a(15) =388371994890
External references
- oeis: A226437