Python 2.4.3 (#1, Mar 27 2007, 00:20:52) 
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class ex:
...  def __init__(self,a=2):
...   self.m=a
...  def up(self,y):
...   return self.m**y
... 
>>> from sys import stdout # :D
>>> a=ex(2)
>>> for i in xrange(1,21):
...  stdout.write("%d\t%d\n"%(i,a.up(i)))
... 
1	 2
2	 4
3	 8
4	 16
5	 32
6	 64
7	 128
8	 256
9	 512
10	1024
11	2048
12	4096
13	8192
14	16384
15	32768
16	65536
17	131072
18	262144
19	524288
20	1048576
>>> for i in xrange(0,65,8):
...  stdout.write("%d\t%d\n"%(i,a.up(i)))
... 
0	 1
8	 256
16	65536
24	16777216
32	4294967296
40	1099511627776
48	281474976710656
56	72057594037927936
64	18446744073709551616
>>> for i in xrange(0,5):
...  j=a.up(3+i)
...  stdout.write("%d\t%d\n"%(j,a.up(j)))
... 
8	 256
16	65536
32	4294967296
64	18446744073709551616
128     340282366920938463463374607431768211456
>>>