Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 9.

A238920

Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 9.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =764a(11) =5008a(12) =23980a(13) =98846a(14) =375950a(15) =1353992a(16) =4719178a(17) =16089515a(18) =54175927a(19) =182019983a(20) =614507621a(21) =2078949960a(22) =7035318948a(23) =23778288812a(24) =80187314884a(25) =269618757792a(26) =903570999504

External references