24748domain: NAppears in sequencesNumber of 1-sided polycairos with n cells.at n=8A151534Number of pairs (C,D) where C is a composition of u, D is a composition into distinct parts of v, and u + v = n.at n=14A238439Numbers k such that 3*R_(k+2) + 10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=20A256458