Number of permutations of 5 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.
A151649
Number of permutations of 5 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =25a(2) =182700a(3) =84646275a(4) =18746073375
External references
- oeis: A151649