1, 2, 4, ... 2^{n-1}
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Recent Referers:
  1. https://awacio.hatenadiary.org/entry/20100831/1283264406
  2. http://formula.s21g.com/formulae/46923
  3. http://formula.s21g.com/?1,%202,%204,%20...%202%5E%7Bn-1%...