133000domain: NAppears in sequencesNumber of nonseparable toroidal tree-rooted maps with n + 2 edges and n + 1 vertices.at n=18A006414Easter occurrences on March 22, March 23, ..., April 25 during a 5,700,000-year Gregorian Easter cycle.at n=4A224110Expansion of e.g.f. exp(-1 + Product_{k>=1} 1/(1 - x^k/k)).at n=7A308337