2.
已知数列\(\{{{a}_{n}}\}\)的前\(n\)项和为\({{S}_{n}}\),点\(\left( n,{{S}_{n}} \right)\)在函数\(f(x)={{x}^{2}}-2kx(k\in N)\)图象上,当且仅当\(n=4\)时,\({{S}_{n}}\)的值最小.
\((\)Ⅰ\()\)求数列\(\{{{a}_{n}}\}\)的通项公式;
\((\)Ⅱ\()\)令\({{c}_{n}}=\dfrac{{{a}_{n}}+9}{2}\),数列\(\{{{b}_{n}}\}\)满足\({{b}_{n}}=\dfrac{{{2}^{{{c}_{n}}}}}{({{2}^{{{c}_{n}}}}-1)({{2}^{{{c}_{n+1}}}}-1)}\),记数列\(\{{{b}_{n}}\}\)的前\(n\)项和为\({{T}_{n}}\),若\(2{{m}^{2}}-3m+\dfrac{5}{3}-{{T}_{n}}\leqslant 0\)恒成立,求实数\(m\)的取值范围.