Number of permutations of 3 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.
A151638
Number of permutations of 3 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =243a(4) =12750255a(5) =40396577931
External references
- oeis: A151638