fourier series question ,can anyone help me,i really need help!!

     frequency             amplitude         phase angle
a(1)     0.01              4.9232e-09        1.5683351
a(2)     0.02              2.4613e-09        1.5658741
a(3)     0.03              1.6407e-09        1.5634137
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a(e5)

hii am a new new user about matlab. this is values about fourier series,the result is triangle wave,but i can't write it with loop.can anyone help me.thanks!!!!!

here is foumula