35303692061domain: NAppears in sequencesNumber of distinct quadratic residues mod 3^n.at n=23A039300a(n) = A047848(6, n).at n=12A047854Cogrowth sequence of the 16-element Pauli group C4 o D4 = <S,T,U | s^4, T^2, U^2, S^2(TU)^2, [S,T], [S,U]>.at n=12A377943