已知数列\(\{ a_{n}\}\)满足\(a_{1}{=}1{,}a_{n{+}1}{=}\dfrac{(n{+}1)a_{n}}{2n}{,}(n{∈}N^{{*}})\)，则\(\{ a_{n}\}\)的通项公式为\(a_{n}{=}\) ______ ．