Let be the number of sequences where in which no six consecutive blocks are equal. Prove that when
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Let $S_n$ be the number of sequences $(a_1, a_2, \ldots, a_n),$ where $a_i \in \{0,1\},$ in which no six consecutive blocks are equal. Prove that $S_n \rightarrow \infty$ when $n \rightarrow \infty.$
Izvor: Međunarodna matematička olimpijada, shortlist 1993
Školjka 
be the number of sequences 
where 
in which no six consecutive blocks are equal. Prove that 
when 