Transpose and Concatenate help

Hi, I have a long list of numbers in column A (A2:A50) and I need to show these in one single cell. With a space separating each number.

How do I do that ? I've tried to concatenate and transpose in one go and can get them all in one cell, but without a space. I tried to put a column of spaces in B, but still couldn't make it work.

Many thanks.