Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly n local maxima.
A334779
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly n local maxima.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =88a(5) =1480a(6) =40272a(7) =1476944a(8) =71865728a(9) =4454840448a(10) =343059301120
External references
- oeis: A334779