57843domain: NAppears in sequencesInfima closed sets in rooted plane trees on n nodes.at n=7A007855Numerators of increasingly better rational approximations to Pi with increasing denominators (3/1, 13/4, 16/5, 19/6, 22/7, 179/57, ...)at n=30A063674Numbers k that divide the k-th isolated number.at n=9A168047