asking references

N. J. A. Sloane njas at
Wed Mar 26 22:57:38 CET 2003

Emeric said:

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.

Me:  well, seqfans are supposed to know that the
first thing you do is look it up in the OEIS!
It is A000522, and there a lot of references!

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