a_1=1\ ,\ \ a_n=a_{n-1}+n!\cdot n\ \ \ (n\ge2)
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Recent Referers:
  1. https://formula.s21g.com/?a_1%3D1%5C%20,%5C%20%5C%20a_n%3...
  2. http://blog.s21g.com/?page=11
  3. http://blog.s21g.com/articles/2012.8.9