Number of self-inverse permutations in S_n with longest increasing subsequence of length 3.
A217323
Number of self-inverse permutations in S_n with longest increasing subsequence of length 3.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =31a(4) =92a(5) =253a(6) =709a(7) =1936a(8) =5336a(9) =14587a(10) =40119a(11) =110202a(12) =304137a(13) =840597a(14) =2332469a(15) =6487762a(16) =18106906a(17) =50667263a(18) =142194843a(19) =400057791a(20) =1128408337a(21) =3190023641a(22) =9038202201a(23) =25659417876a(24) =72987714502a(25) =207983161609a(26) =593665226069
External references
- oeis: A217323