Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
A151608
Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =400a(2) =78900a(3) =4232384a(4) =164553580a(5) =5706469776
External references
- oeis: A151608