118279949136domain: NAppears in sequencesExpansion of (1-x)^(-1)/(1 - 2*x - x^2 - x^3).at n=27A077849a(1) = least k such that 1/2 + 1/3 < H(k) - H(3); a(2) = least k such that H(a(1)) - H(3) < H(k) -H(a(1)), and for n > 2, a(n) = least k such that H(a(n-1)) - H(a(n-2)) > H(k) - H(a(n-1)), where H = harmonic number.at n=25A227653