F pascal_upp(n)
   V s = [[0] * n] * n
   s[0] = [1] * n
   L(i) 1 .< n
      L(j) i .< n
         s[i][j] = s[i - 1][j - 1] + s[i][j - 1]
   R s

F pascal_low(n)
   V upp = pascal_upp(n)
   V s = [[0] * n] * n
   L(x) 0 .< n
      L(y) 0 .< n
         s[y][x] = upp[x][y]
   R s

F pascal_sym(n)
   V s = [[1] * n] * n
   L(i) 1 .< n
      L(j) 1 .< n
         s[i][j] = s[i - 1][j] + s[i][j - 1]
   R s

F pp(mat)
   print(‘[’mat.map(String).join(",\n ")‘]’)

-V n = 5
print(‘Upper:’)
pp(pascal_upp(n))
print("\nLower:")
pp(pascal_low(n))
print("\nSymmetric:")
pp(pascal_sym(n))