t-size: medium">输入群的阶数n(4&lt;=n&lt;=3000)。 </span></div>
<div style="text-indent: 15.75pt"><span style="font-size: medium">&nbsp;</span></div></div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输出格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content><div style="text-indent: 15.75pt"><span style="font-size: medium">输出n阶群的种类数。</span></div>