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<tex dpi="350">Seq(I)(t)=\frac{1}{1-\frac{t}{1-t}}=\frac{1-t}{1-2t}=\frac{1}{1-2t}-\frac{t}{1-2t}</tex>
<tex dpi="350">\left [ t^n \right ] \frac{1-t}{1-2t} = \left\{\begin{matrix}2 ^ n - 2 ^ {n - 1} = \left\{\begin{matrix}2 ^ {n - 1}, n > 0
\\
1, n = 0
