Number of permutations of 1..n with both permutation and its inverse having exactly 5 maxima.
A180395
Number of permutations of 1..n with both permutation and its inverse having exactly 5 maxima.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =213a(9) =38970a(10) =2199243a(11) =66436204a(12) =1334964325a(13) =20003126222a(14) =239548888455
External references
- oeis: A180395