16 lines
387 B
Haskell
16 lines
387 B
Haskell
bellTri :: [[Integer]]
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bellTri =
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let f xs = (last xs, xs)
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in map snd (iterate (f . uncurry (scanl (+))) (1, [1]))
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bell :: [Integer]
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bell = map head bellTri
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main :: IO ()
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main = do
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putStrLn "First 10 rows of Bell's Triangle:"
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mapM_ print (take 10 bellTri)
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putStrLn "\nFirst 15 Bell numbers:"
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mapM_ print (take 15 bell)
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putStrLn "\n50th Bell number:"
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print (bell !! 49)
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