The number of signals that can be generated by using 6 differently coloured flags, when any number of them may be hoisted at a time is

How many different signals can be made by hoisting 6 differently coloured flags one above the other when any number of them may be hoisted at once?

The number of signals that can be sent by 5 flags of different colours, taking one or more at a time is :

The number of signals that can be sent by 5 flags of different colours, taking one or more at a time is :

What is the number of signals that can be sent by 6 flage of different colour taking one or more at a time ?