1,2
Dean, Richard A.; A sequence without repeats on x, x^{-1}, y, y^{-1}. Amer. Math. Monthly 72 1965 383-385.
Dejean, F.; Sur un theoreme de Thue. J. Combinatorial Theory Ser. A 13 (1972), 90-99.
Adjacent sequences: A003321 A003322 A003323 this_sequence A003325 A003326 A003327
Sequence in context: A074057 A141063 A138223 this_sequence A110630 A129717 A117742
nonn,nice
njas
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