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Aperiodic words on three symbols. (English) Zbl 0441.05007


MSC:

05A99 Enumerative combinatorics
11B39 Fibonacci and Lucas numbers and polynomials and generalizations
03D40 Word problems, etc. in computability and recursion theory
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Online Encyclopedia of Integer Sequences:

Number of dissimilar ternary squarefree words of length n+1.