Number of permutations of 1..n with the permutation and its inverse having the same number of maxima.
A180391
Number of permutations of 1..n with the permutation and its inverse having the same number of maxima.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =16a(4) =74a(5) =372a(6) =2484a(7) =18752a(8) =155654a(9) =1489692a(10) =15673104a(11) =179244512a(12) =2245555252a(13) =30338525896
External references
- oeis: A180391