Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 6.
A238917
Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 6.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =26a(8) =142a(9) =544a(10) =1826a(11) =5651a(12) =16859a(13) =49739a(14) =147605a(15) =437656a(16) =1292876a(17) =3795660a(18) =11066720a(19) =32052260a(20) =92323188a(21) =264835528a(22) =757301423a(23) =2159899295a(24) =6146377790a(25) =17454698660a(26) =49473876635a(27) =139980358007a(28) =395414558802
External references
- oeis: A238917