The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {3,4} for all i from 1 to n-1.
A174706
The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {3,4} for all i from 1 to n-1.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =14a(7) =12a(8) =0a(9) =0a(10) =0a(11) =0a(12) =30a(13) =104a(14) =112a(15) =48a(16) =40a(17) =48a(18) =112a(19) =400a(20) =964a(21) =1276a(22) =1202a(23) =1280a(24) =1714a(25) =3004a(26) =6120a(27) =11472a(28) =16730a(29) =20884
External references
- oeis: A174706