1048990domain: NAppears in sequencesNumber of signed permutations of length n avoiding (-2, 1) and (2, -1).at n=9A193763Number of discrete uninorms defined on the finite chain L_n={0,1,...n}, U:L_n^2->L_n, whose underlying operators are smooth and idempotent, or smooth and idempotent-free.at n=19A366542