编程打印出下图。

<span style="font-family:宋体;">输入<span>5</span></span> 

<span style="font-family:宋体;">输出</span> 

<span style="font-family:宋体;"></span><span style="font-family:宋体;">1*</span> 

<span style="font-family:宋体;"></span><span style="font-family:宋体;">2*3*</span> 

<span style="font-family:宋体;"></span><span style="font-family:宋体;">4*5*6*</span> 

<span style="font-family:宋体;"></span><span style="font-family:宋体;">7*8*9*10*</span> 

<span style="font-family:宋体;"></span><span style="font-family:宋体;">11*12<span>*</span>13<span>*</span>14*15*</span>