\left\{ \begin{array} { l } { s _ { n } = 2 a _ { n } + 1 } \\ { a _ { 1 } = 3 } \end{array} \right.
Solve for s_n, a_n, a_1 (complex solution)
s_{n}=2a_{n}+1
a_{n}\in \mathrm{C}
a_{1}=3
Solve for s_n, a_n, a_1
s_{n}=2a_{n}+1
a_{n}\in \mathrm{R}
a_{1}=3
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