已知\(\left\{ {{a}_{n}} \right\}\)是公差为\(3\)的等差数列,数列\(\left\{ {{b}_{n}} \right\}\)满足\({{b}_{1}}=1,{{b}_{2}}=\dfrac{1}{3},{{a}_{n}}{{b}_{n+1}}+{{b}_{n+1}}=n{{b}_{n}}\) .
\((1)\)求\(\left\{ {{a}_{n}} \right\}\)的通项公式;
\((2)\)求\(\left\{ {{b}_{n}} \right\}\)的前\(n\)项和。