[R] Loop with variable index

[cvandy]

I have a list of 20 values.  The first time through a loop I want to find the
mean and stnd.dev. of the first two values; the second time through the loop
I want to find the mean and stnd. dev. of  the first 3 values, etc. until
the last time through the loop I want to find the mean and stnd. dev. of all
20 values,  so I end up with 19 means and stnd. deviations.
How would I construct such a loop?
Thanks. 
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