Number of nonincreasing odd cycles in all permutations of {1,2,...,n}. A cycle (b(1), b(2), ...) is said to be increasing if, when written with its smallest element in the first position, it satisfies b(1)<b(2)<b(3)<... . A cycle is said to be odd if it has an odd number of entries.
A186768
Number of nonincreasing odd cycles in all permutations of {1,2,...,n}. A cycle (b(1), b(2), ...) is said to be increasing if, when written with its smallest element in the first position, it satisfies b(1)<b(2)<b(3)<... . A cycle is said to be odd if it has an odd number of entries.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =43a(6) =258a(7) =2525a(8) =20200a(9) =222119a(10) =2221190a(11) =28061889a(12) =336742668a(13) =4856656283a(14) =67993187962
External references
- oeis: A186768