Number of self-inverse permutations p on [n] with displacement of elements restricted by 8: |p(i)-i| <= 8.

A239080

Number of self-inverse permutations p on [n] with displacement of elements restricted by 8: |p(i)-i| <= 8.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =232a(8) =764a(9) =2620a(10) =8732a(11) =28068a(12) =88448a(13) =273590a(14) =839026a(15) =2559590a(16) =7810344a(17) =23899859a(18) =73552737a(19) =227149812a(20) =702978992a(21) =2177474284a(22) =6745619532a(23) =20888771872a(24) =64643999584a(25) =199916632224a(26) =617935452464

External references