S(n+1)=S(n) + 6*n;
或S(n)=3*n*(n-1)+2;
http://blog.sina.com.cn/s/blog_49be662301000722.html
http://www.blogms.com/StBlogPageMain/Efp_BlogLogKan.aspx?cBlogLog=1000287420
S(n+1)=S(n) + 6*n;
或S(n)=3*n*(n-1)+2;
http://blog.sina.com.cn/s/blog_49be662301000722.html
http://www.blogms.com/StBlogPageMain/Efp_BlogLogKan.aspx?cBlogLog=1000287420