What is the easiest way to calculate the subfactorial of a number?

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2007-02-03 16:57:07 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

Use the formula on a calculator:

!n = n! / e

rounded off to the nearest integer, where e is Euler's number. It actually works, you try it.

2007-02-03 17:33:14 · answer #1 · answered by Scythian1950 7 · 0⤊ 0⤋

What's a 'subfactorial'?

2007-02-03 17:21:34 · answer #2 · answered by modulo_function 7 · 0⤊ 1⤋