已知等比数列\(\left\{{a}_{n}\right\} \)单调递增,记数列\(\left\{{a}_{n}\right\} \)的前\(n \)项之和为\({S}_{n} \),且满足条件\({a}_{2}=6,{S}_{3}=26 \)
\((\)Ⅰ\()\)求数列\(\left\{{a}_{n}\right\} \)的通项公式;
\((\)Ⅱ\()\)设\({b}_{n}={a}_{n}-2n \),求数列\(\left\{{b}_{n}\right\} \)的前\(n \)项之和\({T}_{n} \).