Issue with Promise chaining

Thanks Gordon. It has been nearly 2 decades since I used js at all.
That is at least one step closer. Now it is executing the drawing function sequentially but it is doing it 5 times with the final value of "a".
It seems it is passing the reference of "a" in stead of the value of "a" to the promise function...
I forgot the mess javascripts references were in...
I completely forgot how to pass a variable to a promise without referencing to itself...
Am I forced to use an array and passing that to the promise function to resolve this or is there a better way to do this?
So far I have tried quite a few things but it seems all that is passed to the promise function is the final value of "a"