A=\{1,2,3,\cdots,2n\}
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Recent Referers:
  1. http://formula.s21g.com/?A%3D%5C%7B1,2,3,%5Ccdots,2n%5C%7D
  2. http://formula.s21g.com/
  3. http://blog.s21g.com/?page=7
  4. http://blog.s21g.com/lvs/articles/2012.8.8
  5. http://blog.s21g.com/?page=4