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#!/opt/local/bin/python
#
# See ../README.md
#
#
# Run as: python ch-2.py
#
import sys
COUNT = 10
PLAIN = 0
COMPUTE = 1
type = PLAIN
if len (sys . argv) > 1 and sys . argv [1] == "compute":
type = COMPUTE
if type == PLAIN:
print ("1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147")
if type == COMPUTE:
bell = [[1]]
for x in range (1, COUNT - 1):
bell . append ([bell [x - 1] [x - 1]])
for y in range (1, x + 1):
bell [x] . append (bell [x] [y - 1] + bell [x - 1] [y - 1])
print (1, end = '')
for x in range (0, COUNT - 1):
print (",", bell [x] [x], end = '')
print ("")
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