9651449

Appears in sequences

• Expansion of (1+x)(1+x^2)/(1-x-x^3).at n=41A003410
• a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n-1) + 2*a(n-2) + a(n-3).at n=21A101399
• 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=42A226275