Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
A151598
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =24a(2) =5292a(3) =191920a(4) =4441300a(5) =86631624a(6) =1564073084
External references
- oeis: A151598