Number of permutations of {1,2,...,n} such that for every k >= 1, the k-th differences are distinct.
A327845
Number of permutations of {1,2,...,n} such that for every k >= 1, the k-th differences are distinct.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =40a(5) =132a(6) =428a(7) =1668a(8) =7628a(9) =36924a(10) =199000a(11) =1161824a(12) =7231332
External references
- oeis: A327845