%N Exclusionary square associated to corresponding smallest n-digit number (A112321), or 0 if no such number exists.
%C m has an exclusionary square if m consists of distinct digits and m^2 is made up only of digits not appearing in m.
%Y Cf. A112321, A110816.
%A _Lekraj Beedassy_ and _Klaus Brockhaus_, Sep 08 2005