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Table of n, a(n) for n=1..22.
a(5)=6 because 6 is the length of 110100 or 101100, which are the 2 possible shortest common superstrings of 1,10,11,100,101.
Sequence in context: A106006 A050460 A246594 * A163380 A233569 A246593
Adjacent sequences: A175805 A175806 A175807 * A175809 A175810 A175811
Vladimir Reshetnikov, Sep 08 2010