{j1j2j31j3j2}=(-1)J+1⁢2⁢(j2⁢(j2+1)+j3⁢(j3+1)-j1⁢(j1+1))(2⁢j2⁢(2⁢j2+1)⁢(2⁢j2+2)⁢2⁢j3⁢(2⁢j3+1)⁢(2⁢j3+2))12.