Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.
A159727
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.
Terms
- a(0) =8a(1) =60a(2) =400a(3) =2500a(4) =15000a(5) =87500a(6) =500000a(7) =2812500a(8) =15625000a(9) =85937500a(10) =468750000a(11) =2539062500a(12) =13671875000a(13) =73242187500a(14) =390625000000
External references
- oeis: A159727