Number of self-inverse permutations p on [n] with displacement of elements restricted by 7: |p(i)-i| <= 7.

A239079

Number of self-inverse permutations p on [n] with displacement of elements restricted by 7: |p(i)-i| <= 7.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =232a(8) =764a(9) =2388a(10) =7280a(11) =21574a(12) =63162a(13) =183286a(14) =531576a(15) =1545583a(16) =4523049a(17) =13283748a(18) =39091824a(19) =115105436a(20) =338866164a(21) =996931680a(22) =2930722336a(23) =8610252768a(24) =25290067376a(25) =74279609504a(26) =218185834860a(27) =640968565724

External references