seq - Creating a repeating vector sequence in R -

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i need help. how create following vector sequence:

 1 1 1 1 2 2 2 3 3 4

i tried use (rep) , (seq) still unsucessfull.

try this:

rep(1:4,4:1)

output:

[1] 1 1 1 1 2 2 2 3 3 4

ANy