Evaluate the Integral by Reversing the Order of Integration $$\int _ { 0 } ^ { 1 } \int _ { 2 n } ^ { 2 } e ^ { x ^ { 2 } } d x d y$$

Evaluate the integral by reversing the order of integration.
$$\int _ { 0 } ^ { 1 } \int _ { 2 n } ^ { 2 } e ^ { x ^ { 2 } } d x d y$$