(Number of permutations of {1,2,...,n} for which sums of adjacent numbers are all distinct)/2n.
A040018
(Number of permutations of {1,2,...,n} for which sums of adjacent numbers are all distinct)/2n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =46a(5) =176a(6) =955a(7) =5446a(8) =36122a(9) =259084a(10) =2043944a(11) =17371318a(12) =159616680a(13) =1566391958
External references
- oeis: A040018