Number of permutations of 3 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order.
A151636
Number of permutations of 3 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =49682a(4) =58571184a(5) =21475242671
External references
- oeis: A151636