Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
A151603
Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =80a(2) =1395a(3) =12560a(4) =96575a(5) =698940a(6) =4897655a(7) =33590720a(8) =226746135a(9) =1511651900a(10) =9976916015a(11) =65303466480a(12) =424472551295
External references
- oeis: A151603