[R] how to make this sequence: 1,2,3,4,5,4,3,2,1

[kensuguro]

I'm just beginning R, with book Using R for Introductory Statistics, and one
of the early questions has me baffled.  The question is, create the
sequence: 1,2,3,4,5,4,3,2,1 using seq() and rep().

Now, as a programmer, I am punching myself to not be able to figure it out..
I mean, as simple as a for loop, but using seq, I am stumped.  I would think
c(1:5, 4:1) would be the brute force method with very non intelligent
coding..  there has to be a way to make the "turning point" (in this case 5)
parametric right?  So you could change it later and the sequence will
reflect it.
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