Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
A151604
Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =120a(2) =23580a(3) =1041140a(4) =31611675a(5) =836679060
External references
- oeis: A151604