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Your Computecubics method takes param as input, but you're using pub_param in the function code. Replace pub_param with param, and you're good to go !

Also here are some advice:

• try to follow the pep8 and Ros code style for python. Also use CamelCase names forros msg and srv
• in node 1: create your publisher after the rospy.init
• in node2:
  • you're creating a ServiceProxy but not saving it into a variable. You'll need it if you want to use it later
  • you are saving your publisher in the param variable instead of the coeffs. try using more self-explanatory variable names