Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7.

A238918

Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =76a(9) =438a(10) =1846a(11) =6664a(12) =22322a(13) =71223a(14) =221747a(15) =685899a(16) =2133273a(17) =6639848a(18) =20631028a(19) =63857132a(20) =196698620a(21) =602652416a(22) =1837237916a(23) =5577247428a(24) =16876196404a(25) =50936285192a(26) =153419520771a(27) =461274617487

External references