53786domain: NAppears in sequencesNumber of Dyck paths of knight moves.at n=16A005220Number of distinct solutions of sum{i=1..3}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.at n=19A180785a(n) is the position of the first occurrence of n^3 in the concatenation of the positive integers in decimal representation.at n=30A290787