Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
A151607
Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =150a(2) =2763a(3) =28236a(4) =251205a(5) =2116386a(6) =17292639a(7) =138352920a(8) =1089544473a(9) =8474253870a(10) =65251778163a(11) =498286334052
External references
- oeis: A151607