Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.
A159720
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =40272a(6) =62954948a(7) =24342647424
External references
- oeis: A159720