225090domain: NAppears in sequencesG.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3*n} binomial(3*n,k)^2 * x^k] / A(x)^n * x^n/n ).at n=12A255839Length of the n-th Golomb ruler constructed by the Paul Erdős and Pál Turán formula.at n=16A380790