DouKaku?

module Main where
import Data.List
import qualified System.IO.UTF8 as U

partitionNum n = sortBy cmp $ pttn n n
  where cmp a b | length a < length b  = LT
                | length a == length b = EQ
                | otherwise            = GT
        pttn 0 _ = [[]]
        pttn n k = [(n-x):xs | x <- [max (n-k) 0..n-1], xs <- pttn x (n-x)]

main = U.putStr $ unlines $ foldr chunk [] $ partitionNum 50
  where chunk ns r = map (\n -> replicate n '□') ns ++ [""] ++ r