[tex]\displaystyle\bf\\a_{n} =-4n+3\\\\n=1 \ \ \ \Rightarrow \ \ \ a_{1}=-4\cdot 1+3=-4+3=-1\\\\n=2 \ \ \ \Rightarrow \ \ \ a_{2}=-4\cdot 2+3=-8+3=-5\\\\n=3 \ \ \ \Rightarrow \ \ \ a_{1}=-4\cdot 3+3=-12+3=-9\\\\n=4 \ \ \ \Rightarrow \ \ \ a_{1}=-4\cdot 4+3=-16+3=-13[/tex]

Ответ :  Г