Number of permutations p of [n] with no fixed points and displacement of elements restricted by seven: 1 <= |p(i)-i| <= 7.
A259780
Number of permutations p of [n] with no fixed points and displacement of elements restricted by seven: 1 <= |p(i)-i| <= 7.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =9a(5) =44a(6) =265a(7) =1854a(8) =14833a(9) =101976a(10) =619009a(11) =3449752a(12) =18376224a(13) =96559908a(14) =511111965a(15) =2761247612a(16) =15348014345a(17) =86603917480a(18) =491567055577
External references
- oeis: A259780