Shorthand notation for multi-valued variables

Question

Is there a useful shorthand notation for multi-valued variables, e.g. for $$\large e^{i(2n+\frac 12 )\pi}\qquad \small (n=0,1,2) $$ would it be acceptable to write this as $$\large e^{i\frac {\lbrace1,5,9\rbrace}2\pi} $$ or other similar notation?