105066domain: NAppears in sequencesG.f. satisfies A(x)/A(x^2) = (1 + 9x + 9x^2 + 9x^3 + ...).at n=23A176201G.f. satisfies: A(x) = exp( Sum_{n>=1} A(-x^n)^2 * x^n/n ).at n=13A200438Area A under the trajectory of each odd number in the "3x+1" problem.at n=31A265673