asking references

Emeric Deutsch deutsch at
Wed Mar 26 22:34:18 CET 2003

I believe that the easily proved formula 
	sum(n!/k!, k=0..n) = [n!e] 
is given in some form in many calculus books. I'd like to ask 
the favor of some references. Maple gives eGAMMA(n+1,1) with 
a boldfaced e, whatever that means.
[] is the floor function.

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