Length of wavelet decomposition coefficient vectors using Daubechies 4 ('db4')

Hi

I am currently decomposing a signal using the discrete wavelet transformation and the 'wavedec' function. Say that I wish to get the detail coefficients for 7 levels. I expect that for each following subband, for the coefficients, it gets downsampled by a factor of 2, hence a subsequent subband is represented by only half the amount of samples.

Say I have

data = ones(1,1024);
levels = 7;
[C L] = wavedec(data,levels,'db1');
for i=1:levels
   coefD{i} = detcoef(C,L,i);
end

Then the length of the vectors in 'coefD' will be as I expect it, downsampled by factor 2, (512, 256, 128, 64, 32, 16, 8)

But if I use another Daubechies wavelet, say 'db4', the the lengths of the subband vectors will be 515, 261, 134, 70, 38, 22, 14

Can anyone explain to me how this is, why the length of the subband vector are not equal with different Daubechies wavelets?

Thanks!