Number of permutations of 6 indistinguishable copies of 1..n with exactly 2 adjacent element pairs in decreasing order.
A151651
Number of permutations of 6 indistinguishable copies of 1..n with exactly 2 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =225a(2) =15606a(3) =554931a(4) =16689816a(5) =477537957a(6) =13457517066a(7) =377519524263
External references
- oeis: A151651