Number of permutations of 4 indistinguishable copies of 1..n with exactly 5 adjacent element pairs in decreasing order.
A151643
Number of permutations of 4 indistinguishable copies of 1..n with exactly 5 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =0a(2) =8464a(3) =15018688a(4) =6501577152
External references
- oeis: A151643