Linux – Convert Vertical Text to Horizontal Using tr

I've been reading about https://stackoverflow.com/questions/39791042/convert-vertical-text-into-horizontal-in-shell
and wondering if tr alone can be used to convert vertical text to horizontal.

user@linux:~$ seq 3
1
2
3
user@linux:~$ 

I've tried the following solution, it works but not perfect.

user@linux:~$ seq 3 | tr -d '\n'
123user@linux:~$ 
user@linux:~$ 

Would it be possible to used tr alone to produce output like this?

Desired Output

user@linux:~$ seq 3 | tr command here
123
user@linux:~$