664575

Appears in sequences

• Expansion of (1+x)(1+x^2)/(1-x-x^3).at n=34A003410
• Expansion of (1 - x^2)/(1 - x - x^3).at n=38A058278
• Expansion of (1-x)/(1-x-2*x^2-x^3).at n=19A078007
• a(n) = Sum_{k=0..n} C(n-k, floor(k/2)).at n=35A097333
• Positions of the positive integers in the ordering of rational numbers as generated by the rules: 1 is in S, and if nonzero x is in S, then x+1 and -1/x are in S. (See Comments.)at n=33A226136
• Number of new rationals produced at the n-th iteration by applying the map t -> {t+1, -1/t} to nonzero terms, starting with S[0] = {1}.at n=35A226275