Your permute does not make much sense and implies that there are 14680 dimensions instead of three. Since all the dimensions are listed ordered, it actually does not swap any of them. Here is the way to do it with reshape:
out = reshape(permute(in, [2 1 3]), size(in, 2), [])'
You need to transpose rows and columns before and after the reshape since matlab operates column-wise.
If thinking in terms of reshape and permute hurts your head (it does for me), it is simpler to go through a cell array and plain concatenation. The downside is speed:
out = num2cell(in, [1 2]); %split into cell array keeping dimensions 1 and 2 together
out = vertcat(out{:}) %concatenate all the cells vertically
