Number of permutations p of [n] such that |p(i+9) - p(i)| <> 9 for i in [n-9].
A360462
Number of permutations p of [n] such that |p(i+9) - p(i)| <> 9 for i in [n-9].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5040a(8) =40320a(9) =362880a(10) =3548160a(11) =37054080a(12) =416551680a(13) =5050368000a(14) =65944535040a(15) =924630958080
External references
- oeis: A360462