Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
A151586
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =184a(2) =41450a(3) =2698344a(4) =101727276a(5) =2846840080a(6) =66502921806
External references
- oeis: A151586