Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 2 local maxima.
A159728
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 2 local maxima.
Terms
- a(0) =36a(1) =2610a(2) =129800a(3) =5748750a(4) =241987500a(5) =9885006250a(6) =395426250000
External references
- oeis: A159728