#!/usr/bin/python

import RPi.GPIO as GPIO
import time

GPIO.setmode( GPIO.BCM )
GPIO.setup( 18, GPIO.OUT )

while True:
   for outer in range( 1, 4 ):
      for inner in range( 1, 6 ):
         print "outer = ", outer, "; inner = ", inner
         GPIO.output( 18, GPIO.HIGH )
         time.sleep( 0.2 * outer )
         GPIO.output( 18, GPIO.LOW )
         time.sleep( 0.2 * outer )