Is there a shorthand for an indicator function of a positive integer?

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Is there a convenient shorthand for an "indicator function" of a positive integer n which vanishes if n is odd and is equal to 1 otherwise? I was thinking about something like

\mathbb{1}_{\{\mathrm{mod}(n,2)=0\}}(n),
but I'm not sure if this would be considered acceptable mathematical notation.
 
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What about
\frac{(-1)^n+ 1}{2}
 
(1 + (-1)n)/2 ?

δ(sin(nπ)) ? :smile:
 
Thanks!
 

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