Number of permutations of 1..n with each sum of three adjacent terms unique.
A147634
Number of permutations of 1..n with each sum of three adjacent terms unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =54a(5) =232a(6) =936a(7) =4136a(8) =19112a(9) =98666a(10) =559598a(11) =3448160a(12) =22951024a(13) =164020894a(14) =1255124388a(15) =10182613618a(16) =87879918338
External references
- oeis: A147634