RosettaCodeData/Task/Permutations-Derangements/Haskell/permutations-derangements-5.hs

5 lines
108 B
Haskell

ghci> take 10 derangements
[1,0,1,2,9,44,265,1854,14833,133496]
ghci> derangements !! 20
895014631192902121