Number of cycle-up-down permutations of [2n] having n cycles.
A344445
Number of cycle-up-down permutations of [2n] having n cycles.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =105a(4) =2345a(5) =69405a(6) =2559667a(7) =113073961a(8) =5820788545a(9) =342176336073
External references
- oeis: A344445