Number of permutations of 4 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order.
A151645
Number of permutations of 4 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =0a(2) =112a(3) =15018688a(4) =69830127680
External references
- oeis: A151645