Number of permutations of 4 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.
A151646
Number of permutations of 4 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =4961755a(4) =93200908410
External references
- oeis: A151646