Number of permutations of 5 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order.
A151648
Number of permutations of 5 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =100a(2) =52800a(3) =6021225a(4) =447069750a(5) =28203920250
External references
- oeis: A151648