Number of permutations of 6 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.
A151653
Number of permutations of 6 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =225a(2) =1424925a(3) =879018750a(4) =286691702976
External references
- oeis: A151653