How many ways can I concatenate the same string?

No.11199968 ViewReplyOriginalReport
For example "ST"+"RING" and "STRI"+"NG" both result in "STRING". So does "S"+"T"+"R"+"I"+"N"+"G"

Let's ignore empty string, so shit like

”” + "" + "STRING" doesn't count as unique from "STRING".

How do I calculate how many different ways a string with length N can be concatenated?