# [05AB1E], <s>8</s> 7 bytes

    εL¾+èO¼

[Try it online!][TIO-jihqo0iz]

[05AB1E]: https://github.com/Adriandmen/05AB1E
[TIO-jihqo0iz]: https://tio.run/##MzBNTDJM/f//3FafQ/u0D6/wP7Tn//9oIwsdIx0TIDYGYxMdUx3jWAA "05AB1E – Try It Online"

**Explanation**

    ε        # apply to each element x of the input
     L       # push range [1 ... x]
      ¾+     # add counter to each (initially 0)
        è    # cyclically index into input with each
         O   # sum
          ¼  # increment counter