mathematical expressions

Hi everybody,

I am looking for ascii art representations of mathematical expressions.
I have heard of some math programs like maple having an export to
ascii-art, but I do not have this program at hand.
The most I am interested in symbols like the integral symbol for
example. Is there a web site with a complete set of such symbols in
ascii?

Thanks,
Markus

PS: Here is what I have already found:

  2                              -------------
 ---   pi       3 * pi          /  9      2
 \    ---   =  --------  =     /  --- * pi
 /     n          2          \/    4
 ---
 n=1

               k                                k
              ___                              ___
              \     / k \    i    k - i        \     / k \    k    k
(n + a) ^ k =  >   |     | n    a         <=    >   |     | n    a
              /__   \ i /                      /__   \ i /

             i = 0                            i = 0

                k
               ___
           k  \      / k \        k      k         k
   = (n a)     >    |     |   = n    c a     =  O(n )
              /___   \ i /
              i = 0

              n
             ___
             \       n - k    k
  (x - y) *   )    x        y
             /___
            k = 0

    ----------
   / 1 + x
  v

    --------
  3/ 1 + x
  v

  _
_/  f(x) dx > 0.

  oo                2
 ---    1        __
 \     ---   =   ||
 /       2       ---
 ---    n         6
 n=1

  oo
   /   1
  |    -  dx    = log(x) + C
  /    x
  1

       1
 lim  ---
n->oo  n

                    _
12 + 144 + 20 + 3 \/4             2
--------------------- + 5*11  =  9
          7