Number of permutations of 1..n with i-9<=p(i)<=i+8.
A179361
Number of permutations of 1..n with i-9<=p(i)<=i+8.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =40320a(8) =362880a(9) =3265920a(10) =26812800a(11) =204336720a(12) =1473725520a(13) =10249719720a(14) =69881149176a(15) =473288433594
External references
- oeis: A179361