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A The "Beautiful" Formula

  1. May 12, 2016 #1
  2. jcsd
  3. May 12, 2016 #2


    Staff: Mentor

    I think there's a mistake in the MathWorld formula the summation of n=0 should be k=0

    ##m(n) = 1/( n! ) + 1/( n! * (n-1)! ) + 1/( n! * (n-1)! * (n-2)! ) + ...##
  4. May 12, 2016 #3
    Thank you for your reply jedishrfu,
    The article seems related to multifactorials with k being the number of exclamation marks, such as 2 marks for doublefactorial and more by similar extension.
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