Number of self-inverse permutations p on [n] with displacement of elements restricted by 5: |p(i)-i| <= 5.

A239077

Number of self-inverse permutations p on [n] with displacement of elements restricted by 5: |p(i)-i| <= 5.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =206a(8) =546a(9) =1406a(10) =3608a(11) =9259a(12) =23981a(13) =62324a(14) =162224a(15) =422028a(16) =1096900a(17) =2848240a(18) =7394076a(19) =19196044a(20) =49844356a(21) =129443736a(22) =336182997a(23) =873106045a(24) =2267493182a(25) =5888625652a(26) =15292437454a(27) =39713590230a(28) =103134439084a(29) =267836774530

External references