Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by five: p(i)<>i and (i-p(i) mod n <= 5 or p(i)-i mod n <= 5).
A260094
Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by five: p(i)<>i and (i-p(i) mod n <= 5 or p(i)-i mod n <= 5).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =9a(5) =44a(6) =265a(7) =1854a(8) =14833a(9) =133496a(10) =1334961a(11) =14684570a(12) =59245120a(13) =238282730a(14) =956135652a(15) =3828509472a(16) =15296722436a(17) =60990443730a(18) =243596762752a(19) =975165838970
External references
- oeis: A260094