I think it's going to depend very much on your soil. Corn is such a heavy feeder that two crops in a row might be too much, and even if you have a cover crop in between you still have to manage that and it won't replace all the fertility you lost. To me you would be much better off rotating as others here suggest. I agree that bush beans make a nice following crop.
Personally I stopped growing corn because of the
water and fertility requirements. I love eating it, just not dealing with it. Plus I might gross $1 / row foot, a fraction of any other crop.