Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
A151606
Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =2a(2) =268128a(3) =256405004a(4) =82725015630
External references
- oeis: A151606